fix(highway): the paused-frame throttle was throttling the whole venue

Pausing the song dropped the venue, the crowd and the stage to ~10 fps —
"everything around the highway drops fps by a lot".

draw() caps paused frames to one per _PAUSED_FRAME_INTERVAL_MS (100ms), on an
assumption stated plainly in highway-constants.js: a heavy WebGL renderer "does
a full render every frame even while paused. That is pure waste." That was true
when a paused chart was a still picture.

The venue broke the assumption. Its video backdrop keeps playing and its crowd
reacts on a clock of their own, and BOTH are drawn into the same canvas as the
notes — so a throttle aimed at static notes throttled the entire room. The
scene only got a texture upload 10 times a second while the transport sat
paused.

Renderers can now declare that their picture is not static while the chart
clock is stopped: an optional needsContinuousFrames(). The throttle is skipped
only when it returns exactly true, and the probe fails closed — a renderer that
doesn't implement it, or one that throws, keeps the throttle unchanged. So the
GPU saving that motivated #654 survives everywhere it was actually valid.

highway_3d implements it and claims continuous frames ONLY while a crowd video
is genuinely rolling (bound, unpaused, not ended, readyState >= 2). With no
venue pack — the common case — the paused scene really is static, so it keeps
the throttle and the GPU still idles.

Tests extend tests/js/highway_pause_throttle.test.js, which guards this code
path source-level (the draw loop owns the rAF + WebGL lifecycle and is
deliberately not reproduced in a vm — see the file header). The new guards pin
that the capability GATES the early return rather than merely being called near
it, that the probe fails closed on absent/non-function/throwing/truthy-but-not-
true, and that the 3D renderer keys off the real video elements and can still
return false. All 3 fail against the pre-fix source.

eslint 0 errors; JS 1202/1202; pytest 2597 passed.

.github/pull_request_template.md

@@ -0,0 +1,17 @@
+## What
+
+<!-- What does this PR do, and why? Link the issue it addresses. -->
+
+## feedpak surface
+
+<!-- The feedpak spec is sacrosanct: the spec defines the format, this app implements it.
+     Delete this section ONLY if your change doesn't touch how the app reads or writes packs. -->
+
+- [ ] This PR does **not** change how the app reads/writes feedpaks (manifest keys, pack files, folder layout)
+- [ ] …or it does, and the spec change landed first via the [FEP process](https://github.com/got-feedback/feedpak-spec/blob/main/CONTRIBUTING.md) — FEP / spec PR: `got-feedback/feedpak-spec#___` (once it merges, re-run this PR's checks and the gate goes green)
+
+## Checklist
+
+- [ ] `CHANGELOG.md` `[Unreleased]` updated (user-visible changes)
+- [ ] Tests added/updated for new behaviour
+- [ ] Commits are DCO signed off (`git commit -s`)

.github/workflows/ci.yml

@@ -124,6 +124,94 @@ jobs:
           print(f"Validated {len(manifests)} manifest(s) — OK")
           EOF
 
+  feedpak-spec:
+    # Guard that core stays faithful to the feedpak format spec, which lives in
+    # its own repo (got-feedback/feedpak-spec) and is the contract third-party
+    # packers and players build against. Four surface checks: core reads/writes
+    # only manifest keys the spec declares (and the scanned-module list can't
+    # fall behind); the exception allowlist never grows, so the FEP process is
+    # the only way a new key lands; core ingests the spec's example packs; packs
+    # committed here pass the spec's reference validator. Motivated by
+    # #933, where a manifest key (`original_audio`) shipped in core without ever
+    # reaching the spec.
+    #
+    # The gate checks against the spec repo's HEAD, deliberately: the app must
+    # conform to the LIVING spec, always. The dev flow is self-serve — a gated
+    # PR opens a FEP, the spec PR merges, re-running this job goes green; no
+    # pin file to bump, nothing to maintain. Accepted trade-off: a BREAKING
+    # spec change (rare, deliberate, MAJOR per the spec's compatibility policy)
+    # reddens every PR here until core conforms — which is the correct
+    # org-wide signal that the app is out of conformance. The normal FEP is
+    # additive and can never redden this job.
+    name: feedpak-spec
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        # This job runs repository code (tools/check_spec_conformance.py) and
+        # never pushes; don't leave the token in git config for it.
+        # fetch-depth: 0 so the base branch is available — the gate must prove
+        # the exception allowlist didn't grow in this PR.
+        with:
+          persist-credentials: false
+          fetch-depth: 0
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      - name: Check out feedpak-spec at HEAD
+        uses: actions/checkout@v4
+        with:
+          repository: got-feedback/feedpak-spec
+          ref: main
+          path: .feedpak-spec
+          persist-credentials: false
+
+      - name: Record the spec commit this run verified against
+        # HEAD-tracking means CI results can differ across time on the same
+        # commit. Log the exact spec SHA so a red run is reproducible.
+        run: git -C .feedpak-spec rev-parse HEAD
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          # CI-only: the spec's reference validator needs jsonschema. Not a
+          # runtime dependency — this gate never runs on the serve/Docker path
+          # (constitution Principle I). Pinned for the same reason the spec SHA
+          # is: an upstream release must not turn this job red on a PR that
+          # changed neither this repo nor the spec.
+          pip install 'jsonschema==4.26.0'
+
+      - name: Fetch the base branch's exception allowlist
+        id: baseline
+        run: |
+          # The allowlist is closed: it grandfathers keys that predate this gate
+          # and may only shrink. Prove that by diffing against the base branch —
+          # without this, anyone could append an entry and route around the FEP
+          # process from inside this repo.
+          #
+          # Resolve the base rather than hardcoding `main`: ship-ci.yml also runs
+          # this workflow for PRs into release/** and for pushes to release/**,
+          # where a main baseline would diff against the wrong branch.
+          #   PR   -> the branch it merges into
+          #   push -> the branch itself (its tip already contains the change, so
+          #           this is a no-op; enforcement happens at PR time)
+          BASE="${{ github.event.pull_request.base.ref || github.ref_name }}"
+          echo "diffing the allowlist against origin/$BASE"
+          git fetch --no-tags --depth=1 origin "$BASE"
+          if git cat-file -e FETCH_HEAD:feedpak-spec-exceptions.yml 2>/dev/null; then
+            git show FETCH_HEAD:feedpak-spec-exceptions.yml > "$RUNNER_TEMP/baseline-exceptions.yml"
+            echo "args=--baseline-exceptions $RUNNER_TEMP/baseline-exceptions.yml" >> "$GITHUB_OUTPUT"
+          else
+            # Only true until the PR that introduces this gate lands.
+            echo "args=--bootstrap-allowlist" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Check feedpak spec conformance
+        run: python tools/check_spec_conformance.py --spec .feedpak-spec ${{ steps.baseline.outputs.args }}
+
   lint:
     # Maintainer/CI-only size + module-hygiene gate (constitution Principle I:
     # dev tooling, never on the serve/Docker path — same category as

CHANGELOG.md

@@ -8,13 +8,135 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
+- **Gold tier (career passports)** — an earned badge turns **gold** when
+  Virtuoso verifies an improvised jam in the passport's style (the
+  `gold_improv` artifact relays with the drill snapshot; a genre inherits its
+  family's style, gained-only, and gold never substitutes for the badge bar
+  itself). Gold gets its own ceremony, stamp slam, foil chip, and gold ink on
+  the shelf cover, profile wall, and passport card; the bronze page's "Gold
+  rung coming" preview becomes a live invitation to jam it.
+- **Gigs (the career verb, frontend)** — book a gig from any opened passport:
+  a gig poster proposes the setlist (re-roll for a different bill; save or
+  copy the poster as a PNG), "Play the gig" hands the set to the play queue
+  with the venue on stage, a floating strip tracks the set, and finishing it
+  logs dated entries with per-song accuracies in the passport book — with an
+  encore celebration (crowd eruption + confetti) when the whole set clears
+  the bar, and a summary poster to share. Quitting mid-set simply abandons
+  it: no log, no fail state.
+- **Career on the Profile and Home pages** — the Profile gains a passport
+  wall (earned-badge covers per instrument, hours, gig count; absent until a
+  passport exists), injected through the same mount-point + rendered-event
+  seam the achievements plugin uses (now documented in docs/plugin-v3-ui.md).
+  The home page's plugin-count stat tile becomes a career trading card
+  (badges, hours, the closest stamp ask, foil shine) with the old stat as the
+  built-in fallback when career has no state. Earned passports gain **Save
+  card / Copy card** — a natively-drawn PNG passport card, downloadable or
+  copied straight to the clipboard for pasting outside the app (shared
+  `blob-io` helpers replace the download idiom previously duplicated in
+  settings-io and diagnostics-export).
+- **Gigs (backend)** — career mode gains its verb: `POST
+  /api/plugins/career/gigs/propose` builds a playable setlist for an
+  instrument+genre (your qualifying songs plus a couple of stakes songs near
+  the bar; a young passport fills from unplayed genre songs — the first gig
+  is how stubs start; re-roll by calling again), naming the room your stars
+  can book. `POST /gigs` logs a **completed** set — per-song accuracies read
+  from the set's own freshly-recorded stats, an encore flag at the
+  data-driven bar (avg ≥ 75%) — into the career state; abandoned sets never
+  log (no fail state: the gig you finished is the gig you played). Passports
+  carry their gig log; instruments their gig count.
+
+### Changed
+- **Folder library renders only the songs on screen** (#965) — a song list used to
+  render *every* song it held. On a flat 50,944-song library that was one `<div>`
+  with 50,938 children and ~1.3 **million** DOM nodes (~4.2 GB of renderer memory),
+  built even while another screen was showing. A document that size also punishes
+  unrelated code: any `document.querySelector` that misses has to walk the whole
+  tree — which is how the song-preview menu check ended up eating ~50% of the
+  renderer and dropping the app to 2.7 fps. Lists longer than 200 songs are now
+  windowed (25–31 rows in the DOM instead of 50,000); shorter lists are unchanged.
+- **The full mix is a stem** (#933) — core no longer depends on `original_audio:`, a
+  top-level manifest key this repo invented (#583) that the feedpak spec never had.
+  The format already carried the pre-separation mixdown as a stem; feedpak 1.15.0
+  (feedpak-spec#53) reserves the id **`full`** for it, so that is where core reads it
+  from now.
+
+  `full` is a mixdown, not a layer — it already contains every instrument — so
+  `load_song()` lifts it OUT of `LoadedSloppak.stems` onto `LoadedSloppak.full_mix`.
+  Nothing that sums stems or renders one fader per stem can see it, which is what
+  makes retaining it safe; leaving it in the list would double the whole song and
+  leave "guitar" audible with the guitar fader muted. That trap is exactly why the
+  packer invented the key instead of putting the mixdown where the format says it
+  goes — the bug was in the reader, and this fixes the reader.
+
+  Consequences worth knowing:
+  - The highway WS `song_info` frame gains `full_mix_url` / `has_full_mix`.
+    `original_audio_url` / `has_original_audio` remain as **deprecated aliases**
+    (same values) for one release so a client built against the old frame keeps
+    working; they go with the fallback below (#945).
+  - `stems` on `song_info`, and `stem_ids` / `stem_count` in the library index, now
+    describe *instrument* stems only — a separated pack that retains its mixdown no
+    longer advertises a bogus "full" stem chip or an inflated stem count.
+  - Audio fingerprinting (`lib/enrichment.py`) now resolves the mixdown the same
+    way, which **widens** its coverage: it previously returned `None` for any pack
+    without the invented key, so fingerprinting silently did nothing for the
+    overwhelming majority of packs.
+  - Core still **reads** `original_audio:` as a deprecated fallback, because every
+    pack written before the spec caught up carries it and would otherwise lose its
+    pristine mix. `tools/migrate_full_mix_stem.py` rewrites those packs into the
+    spec shape (moves `original/full.ogg` → `stems/full.ogg`, adds the `full` stem
+    at `default: off`, drops the key); the fallback and the aliases are removed once
+    they are migrated (#945).
+
+### Added
+- **Genres fall back to MusicBrainz enrichment** — the effective genre now
+  resolves override → pack genre → the enrichment match's primary genre
+  (matched or user-pinned manual rows only). Converted packs rarely carry a `genres` manifest key,
+  which starved the library genre facet and career passports on real
+  libraries; with the fallback, every enriched song's genre is browsable and
+  passport-able immediately, and coverage grows as enrichment runs.
+- **Badge ceremony in the venue** — earning a genre badge now stages a moment:
+  the crowd layer erupts (new public `v3VenueCrowd.celebrate()` — instant
+  ecstatic loop bypassing the stability/dwell hysteresis, plus a cheer stinger;
+  a no-op without a venue pack) and a full-screen overlay drops the bronze
+  stamp with a shine sweep and a confetti burst over whatever screen is active
+  (badges land right after `stats:recorded`, while the player is still up).
+  Click or wait ~4s to dismiss; `prefers-reduced-motion` gets the existing
+  chime + notification only. The stamp still slams into the passport book on
+  next open, unchanged.
+- **Hours-per-genre odometer (career passports)** — the app now measures real
+  play time: the stats recorder accrues **wall-clock** seconds across
+  play/resume ↔ pause/stop/end spans (wall time, not song position — position
+  deltas double-count A-B loops and mis-read seeks; single spans clamp at 2h
+  against suspend/sleep inflation) and piggybacks them as `seconds` on the
+  `POST /api/stats` calls it already makes. New additive
+  `song_stats.seconds_total` column; a seconds-only POST banks time for
+  unscored plays that run to the song's natural end without touching the
+  resume position (and still counts as playing today for the streak).
+  Passports surface it honestly: "14.2 h in Blues" under the badge and on the
+  shelf cover — a true fact that only grows, never a target or a meter.
+- **Career passport drills, curated** — Bronze in blues/rock/metal/funk/jazz
+  now also asks for that genre's signature Virtuoso drill (Blues Shuffle,
+  Power Chords & Backbeat, Gallop Picking, 16th Pocket, Shell Voicings — one
+  per genre, data-driven in `passports.json` with display labels). Drill
+  lists are per-instrument (`virtuoso_nodes: {instrument: [nodes]}`; a flat
+  list still means guitar), so a keys passport never demands a guitar drill.
+  A drill counts as cleared on the first real completion artifact — a
+  top-tier clean pass in one key (`keysCleared`), any depth rung, or
+  mastery — rather than only the maxed-speed depth flips. Genres without a
+  curated drill stay songs-only.
+- **Career passport visuals pack** — earned covers and badge stamps become
+  trading cards (pointer-tracked tilt + light glint, hover-capable devices
+  only); the ghost stamp visibly "carves in" as qualifying songs land (a
+  conic ink fill, no numbers added); the Gold rung preview is a small foil
+  chip with a shimmer sweep, still honestly labeled coming. All theatrics
+  disabled under `prefers-reduced-motion`.
 - **Career passports (backend)** — the badge-journey layer on top of career stars.
   New career-plugin endpoints: `GET /api/plugins/career/passports` (per-instrument
   passport walls: genre badges computed on read from `song_stats` × the library's
   effective genre — Bronze = N genre songs at K★, data-driven in
   `plugins/career/passports.json`, default 5 songs at 2★ — plus qualifying-song
-  "ticket stubs", the library genre list, and drill status), `POST
-  /passports/commit` (instrument commitment), `POST /passports/open` (open a genre
+  "ticket stubs", the library genre list, and drill status), `POST /passports/commit`
+  (instrument commitment), `POST /passports/open` (open a genre
   passport), and `POST /drill-state` (intake for the relayed Virtuoso
   `virtuoso.progress` snapshot, so drill requirements can gate badges
   server-side). Badges are never stored; the only persisted state (commitments,
@@ -35,6 +157,30 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   localStorage snapshot to the drill-state intake on `virtuoso:progress` bus
   events (debounced, plus a one-time bootstrap), closing the
   fires-into-a-void seam without touching the virtuoso plugin.
+- **CI gate: core must stay faithful to the feedpak spec (`feedpak-spec` job).** feedpak is published as
+  an open format with its own repo, normative spec, JSON Schemas, and reference validator — but nothing
+  stopped core from reading a manifest key the spec never defined, which is exactly what happened with
+  `original_audio` (#583 → #933). `tools/check_spec_conformance.py` now enforces four surface properties
+  in CI: (1) **key-coverage** — every manifest key core reads *or writes* is declared in the spec's
+  `manifest.schema.json`, found by walking the AST of `lib/sloppak.py`, `lib/enrichment.py`, and
+  `lib/songmeta.py`, `lib/gp2notation.py`, and `lib/routers/ws_highway.py` (writes are gated too — including
+  `setdefault()` — and reported separately: a key core writes lands in every pack we emit, so an undeclared
+  one seeds the ecosystem with non-spec data; a **readers-complete** guard fails the build if that module
+  list falls behind the codebase); (2) **allowlist-closed** — `feedpak-spec-exceptions.yml` never grows;
+  (3) **forward** — core's `load_song()` ingests every example pack the spec ships;
+  (4) **reverse** — every pack committed here passes the spec's own `tools/validate.py` (7/7 pass today).
+  The gate verifies against the spec repo's **HEAD** — the app must conform to the living spec, and the
+  flow is self-serve: a gated PR opens a FEP, the spec PR merges, re-running checks goes green. Nothing to
+  pin, nothing to bump. Each run logs the spec SHA it verified against so results are reproducible.
+  **There is no in-repo escape hatch, by design.** A blocked PR has exactly one route: land the key in the
+  spec via the [FEP process](https://github.com/got-feedback/feedpak-spec/blob/main/CONTRIBUTING.md), then
+  re-run the PR's checks — the gate verifies against the spec's HEAD, so it goes green once the key is real. `feedpak-spec-exceptions.yml` is a **closed
+  grandfather list** for keys that predate the gate, not a bypass: a fourth check (**allowlist-closed**)
+  diffs it against the base branch and fails any PR that *adds* an entry, so it may only shrink.
+  `original_audio` is grandfathered there against #933 so the gate lands green and starts blocking the
+  *next* instance immediately; the gate takes no position on how #933 resolves (the expected outcome is
+  removing the key, since the spec already carries the mixdown as a stem — not adopting it). Docs:
+  [docs/feedpak-spec-gate.md](docs/feedpak-spec-gate.md).
 
 ### Removed
 - **The classic v2 UI shell is gone — v3 is the only UI (R3a).** `static/index.html`, the
@@ -56,6 +202,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   engine (`app.js`, `highway.js`, `playSong`, `showScreen`, the capability registry).
 
 ### Fixed
+- **Career passports review polish** — the passport tabs and book overlay carry
+  proper ARIA semantics (`aria-selected`/`aria-controls`/`tabpanel`;
+  `role="dialog"` + `aria-modal` with focus moved to the close button on open
+  and restored on close), and a corrupt stored seen-badges value (e.g. a stray
+  `"null"`) can no longer throw on every passport refresh.
 - **The packaged desktop app could not start (`ModuleNotFoundError: No module named
   'appstate'`).** feedback-desktop's `scripts/bundle-slopsmith.sh` copies a *hardcoded
   list* of core files into the app bundle — `server.py`, `VERSION`, `lib/`, `data/`,

CLAUDE.md

@@ -588,6 +588,21 @@ tab, key/scale annotations, etc.). Published as **feedpak**; this codebase still
 **sloppak** name internally — same on-disk format. [docs/sloppak-spec.md](docs/sloppak-spec.md) is
 a local pointer + code map.
 
+**The spec is sacrosanct — read it BEFORE changing how this app reads or writes packs.** The
+spec repo defines the format; this app merely implements it ("a change is not part of the format
+until it lands here" — feedpak-spec/GOVERNANCE.md). Any new manifest key, file, or directory the
+app touches must land in the spec **first**, via the
+[FEP process](https://github.com/got-feedback/feedpak-spec/blob/main/CONTRIBUTING.md) (proposal
+issue → one spec PR updating spec + schemas + example + changelog → then re-run your PR's checks
+here; the gate verifies against the spec's HEAD, so it goes green the moment your key is real).
+CI enforces this: the `feedpak-spec` job
+([docs/feedpak-spec-gate.md](docs/feedpak-spec-gate.md)) fails any PR whose code touches a
+manifest key the spec doesn't declare, and there is **no in-repo bypass** — the exceptions
+file is a closed grandfather list that only shrinks. If the format seems to be missing something
+you need, that's a FEP conversation, not a workaround. (Cautionary tale: `original_audio`, #933 —
+shipped without a spec entry, and third-party packers reverse-engineered a folder convention out
+of a code comment.)
+
 **Key code:**
 - `lib/sloppak.py` — format detection, zip/directory resolution, metadata extraction, song loading
 - `lib/sloppak_convert.py` — sloppak assembly pipeline, Demucs stem splitting

docs/feedpak-spec-gate.md

@@ -0,0 +1,132 @@
+# The feedpak spec-conformance gate
+
+`tools/check_spec_conformance.py`, run in CI as the `feedpak-spec` job.
+
+## Why
+
+feedpak is published as an **open format**: its own repo
+([got-feedback/feedpak-spec](https://github.com/got-feedback/feedpak-spec)), a normative spec, JSON
+Schemas, and a reference validator. That is a promise to everyone outside this codebase — third-party
+packers, converters, and players build against the spec, and the spec is meant to be the complete and
+authoritative description of a pack.
+
+The moment core reads a manifest key the spec doesn't define, that promise breaks silently:
+
+- A spec-compliant pack is no longer guaranteed to be a fully-working pack.
+- The reference validator can't warn authors about a key it has never heard of — it will happily green-light
+  the key, and every misspelling of it.
+- The format's real definition drifts into our source tree. In the case that motivated this gate
+  ([#933](https://github.com/got-feedback/feedback/issues/933)), third-party tooling started emitting an
+  `original/` directory that no code anywhere requires — the convention was reverse-engineered from an
+  example in a *code comment*.
+
+The rule this gate enforces: **any manifest key core reads _or writes_ must be in the spec before core
+ships code that depends on it.** Spec first, implementation second. Writes are not exempt — a key core
+writes lands in every pack we emit, so an undeclared one seeds the ecosystem with non-spec data.
+
+Note that "get it into the spec" is not automatically the right fix for an existing violation — for
+`original_audio` it isn't. The spec already carries the pre-separation mixdown as a stem
+(`{id: full, file: stems/full.ogg}`), so that key added a *second, redundant* location for audio to a format
+that already had one, and the resolution is to remove it rather than bless it. The gate takes no position on
+which way a violation resolves; it only insists that one of the two happens deliberately, in the open,
+before the code merges.
+
+## What it checks
+
+We can't mechanically prove core *interprets* a key the way the spec means. We can prove four surface
+properties, and they cover the drift that actually occurs.
+
+| Layer | Check | Catches |
+|---|---|---|
+| 1. key-coverage | Every manifest key core reads **or writes** is declared in the spec's `manifest.schema.json`. | Core growing a key the spec never defined — the #933 class. |
+| 2. allowlist-closed | `feedpak-spec-exceptions.yml` has not **grown** relative to the base branch. | Someone routing around the FEP process by allowlisting their own new key. |
+| 3. forward | Core's `load_song()` ingests every example pack the spec ships. | The spec adding or tightening something core ignores or breaks on. |
+| 4. reverse | Every pack committed to this repo passes the spec's `tools/validate.py`. | Core (or a contributor) committing a pack the spec would reject. |
+
+Layer 1 works by walking the AST of the modules listed in `READERS` and collecting every literal key touched
+on a manifest dict (`manifest.get("x")`, `manifest["x"]`, and the wrapped
+`(load_manifest(p) or {}).get("x")` form used in `lib/enrichment.py`).
+
+**Reads and writes are both checked, and reported differently.** A key core *writes*
+(`manifest["x"] = v`, as `lib/songmeta.py` does) is spec surface pointed outward: it puts a key into every
+pack we emit, so an undeclared one seeds the ecosystem with non-spec data. Subscripts are classified by AST
+context — `Store` is a write, `Load` is a read — so `manifest["year"] = ...` is not miscounted as a read.
+
+## When it fails
+
+You added a manifest key the spec doesn't define. **There is exactly one way forward, and it is not in this
+repo.**
+
+Land the key in the spec through the **feedpak Enhancement Proposal (FEP)** process
+([feedpak-spec/CONTRIBUTING.md](https://github.com/got-feedback/feedpak-spec/blob/main/CONTRIBUTING.md)):
+
+1. **Open a FEP issue** on `got-feedback/feedpak-spec` — the problem, the proposed on-disk shape (manifest
+   key and/or side-file), backward compatibility, and the version bump it implies.
+2. **Discuss**, until it has a clear shape and rough consensus.
+3. **Land one PR there** that updates the normative spec (`spec/feedpak-v1.md`), the relevant JSON
+   Schema(s), an example in `examples/` that exercises it, and the changelog — *together*. A PR touching
+   only one of those is incomplete.
+4. **Back here**, just re-run your PR's checks. The gate verifies against the spec's HEAD, so the moment
+   your key is genuinely part of the format, your PR goes green — nothing to bump, nothing to maintain.
+
+That's deliberately the only route — no experimental prefix, no self-serve allowlist — and it's usually a
+quick one for additive keys. The reason it's worth the round-trip: the gate checks the whole repo against
+the living spec, so if non-conformance ever lands, it shows up as red CI on *every* teammate's open PR, and
+only the person who introduced it can clear it. Going through the FEP keeps your change clean and keeps
+everyone else unblocked.
+
+The spec's own governance says the same thing:
+
+> This repository defines the format only. Applications that read or write feedpak ... track this spec as a
+> dependency; they do not drive it. **A change is not part of the format until it lands here.**
+> — [feedpak-spec/GOVERNANCE.md](https://github.com/got-feedback/feedpak-spec/blob/main/GOVERNANCE.md)
+
+### `feedpak-spec-exceptions.yml` is a closed grandfather list, not a hatch
+
+It exists solely because `original_audio` predates the gate. **CI fails any PR that adds an entry** (layer 2
+diffs it against the base branch), so the list can only ever shrink. Entries are debt, each carries a
+tracking issue, and each disappears when the underlying key is removed from core. The gate also fails on a
+*stale* entry — the spec caught up, or core stopped touching the key — so the file cannot quietly become
+somewhere drift accumulates.
+
+Deleting an entry does not, by itself, get you past the gate: layer 1 still fails while core reads the key.
+The entry goes when the **code** goes.
+
+## Tracking the spec's HEAD
+
+The gate checks out `feedpak-spec` at **HEAD**, on purpose: the app must conform to the *living* spec, and
+nobody should have to maintain a pin. The dev flow is fully self-serve — gated PR → FEP → spec merge →
+re-run checks → green.
+
+Two properties to know about:
+
+- **The normal FEP is additive** (a new optional key), which only ever makes the gate *looser* — it cannot
+  redden anyone's PR. Only a **breaking** spec change (removing/renaming a key the app uses, tightening the
+  validator against committed packs) turns PRs red repo-wide — and per the spec's compatibility policy that
+  is a rare, deliberate MAJOR event, exactly when an org-wide "the app is out of conformance" signal is the
+  right outcome. The CI job logs the exact spec SHA each run verified against, so a red run is reproducible.
+- **CI results can change over time on the same commit** — that is inherent to tracking a living contract,
+  and it is the point: green means "conformant *now*", not "conformant when written".
+
+## Limitations
+
+Known, and worth fixing in follow-ups rather than blocking on:
+
+- **Layer 1's receiver detection is heuristic.** Locals *assigned from* `load_manifest(...)` are discovered
+  flow-aware whatever they're called (chart.py's `m` taught us that), and the inline
+  `(load_manifest(p) or {}).get(...)` form is recognised — but a manifest that arrives as a **function
+  parameter** is only recognised by name (`MANIFEST_VARS`: `manifest`, `mf`). A parameter called something
+  else would slip. The hardening step is to route all manifest access through a single declared
+  `KNOWN_MANIFEST_KEYS` registry in `lib/sloppak.py`; the gate then compares registry against schema exactly
+  instead of inferring.
+- **Layer 1 covers top-level keys only.** Nested structure (`arrangements[].file`, `.id`, `.notation`) isn't
+  checked. Extending to it means walking the schema's `$ref` subschemas.
+- **Layer 1 recognises `get`, `setdefault`, subscripts, and the known gap-fill helper** as key access.
+  `update()` and `pop()` aren't used against a feedpak manifest anywhere in the tree, so they're deliberately
+  not special-cased rather than speculatively handled. `readers-complete` reuses the same scanner
+  (`keys_touched()`), so this blind spot is shared, not doubled: a module using only unrecognised access forms
+  would evade both.
+- **Layer 4 can't catch unknown keys**, because `manifest.schema.json` sets `additionalProperties: true` and
+  the reference validator deliberately "treats unknown keys/files as forward-compatible". Fixing this
+  properly belongs in the spec (tighten the schema, or give the validator a `--strict` mode). Until then,
+  layer 1 is the only thing standing between us and the next `original_audio`.

docs/plugin-v3-ui.md

@@ -189,3 +189,23 @@ out of the capability graph.
 - [ ] `#player` overlays keep `z-index` ≤ the chrome layers (transport/HUD 20,
       rail 30, popovers 40).
 - [ ] Verify at `/` — it and `/v3` serve the same (and only) v3 shell.
+
+## Injecting into core shells (profile, dashboard)
+
+Core screens that accept plugin sections render **mount points** — usually
+empty, sometimes holding core's own **fallback content** (the Dashboard's
+career slot ships the plugin-count stat) — and announce each (re)build with a
+DOM event, because their `innerHTML` swap wipes anything previously injected.
+A plugin listens for the event and **replaces the mount's content** (never
+append — a fallback may be present) by id — the same seam every time:
+
+| Shell | Event | Mounts |
+| --- | --- | --- |
+| Profile | `v3:profile-rendered` | `#v3-profile-passports-mount` (career wall), `#v3-profile-feats-slot`, `#v3-profile-achievements-mount` |
+| Dashboard | `v3:dashboard-rendered` | `#v3-dash-career-slot` (career card; core's plugin-count stat is the fallback content a plugin may replace) |
+| Settings | `v3:settings-rendered` | per-plugin `settings.html` panels |
+
+Rules: inject on every event (the mount is fresh), keep the section
+**absent-not-empty** (no state → leave the mount alone / empty), and guard
+re-wired listeners with a `dataset` flag when your own refresh path can run
+against an unwiped mount.

docs/size-exemptions.md

@@ -61,6 +61,8 @@ extractions and twenty-two `routers/` modules, plus lib/library_registry.py for
 and is a monolith in its own right, to be split per-table once the router train
 lands) · `static/v3/songs.js` (4,134) · `static/capabilities/audio-session.js`
 (2,974) · `plugins/highway_3d/screen.js` (15,656) · `plugins/keys_highway_3d/screen.js`
-(3,780) · `plugins/drum_highway_3d/screen.js` (3,597) — and every monolith with a PR
+(3,780) · `plugins/drum_highway_3d/screen.js` (3,597) · `plugins/career/screen.js`
+(1,530 — career v3 gigs + gold pushed it over; split plan: carve the gig block into a
+`scriptType: module` file when career work next touches it) — and every monolith with a PR
 train in the refactor plan. Test files (e.g. `tests/test_plugins.py`) are out of scope
 by policy — the norm governs source files.

feedpak-spec-exceptions.yml

@@ -0,0 +1,56 @@
+# CLOSED grandfather list — manifest keys core reads or writes that predate the
+# spec-conformance gate and that the feedpak spec does not define.
+#
+# Please don't add entries here — CI will flag any PR that grows this list, so
+# it can only shrink over time. That's by design, not distrust: the moment the
+# app touches a key the spec doesn't define, every teammate's PR starts failing
+# the conformance gate too, and whoever added the key is the only person who
+# can fix it. The FEP process below avoids putting anyone in that spot. The
+# feedpak spec's own governance is explicit:
+#
+#   "This repository defines the format only. Applications that read or write
+#    feedpak ... track this spec as a dependency; they do not drive it.
+#    A change is not part of the format until it lands here."
+#     — got-feedback/feedpak-spec, GOVERNANCE.md
+#
+# So a new manifest key goes through the feedpak Enhancement Proposal (FEP)
+# process — see feedpak-spec/CONTRIBUTING.md:
+#
+#   1. Open a FEP issue on got-feedback/feedpak-spec describing the problem, the
+#      on-disk shape, backward compatibility, and the version bump implied.
+#   2. Land one PR there updating the normative spec, the JSON Schemas, an
+#      example that exercises it, and the changelog — together.
+#   3. Back here, re-run this PR's checks. The gate verifies against the spec's
+#      HEAD, so once your key is in the spec, the gate goes green.
+#
+# That's the supported route — and usually a quick one for additive keys. If
+# your PR is blocked by this gate, a FEP will get you unblocked properly; an
+# entry here won't (CI rejects it).
+#
+# Entries below exist ONLY because they predate the gate. Each is debt with a
+# tracking issue, and each disappears when its issue is fixed. The gate also
+# fails if an entry goes stale — the spec caught up, or core no longer reads or
+# writes the key — so this file cannot quietly become a place drift hides.
+
+exceptions:
+  - key: original_audio
+    issue: https://github.com/got-feedback/feedback/issues/945
+    reason: >-
+      Added by #583 (the full mix played while every stem fader sits at unity,
+      since demucs recombination is lossy). It never went through a FEP and the
+      spec does not define it — the drift this gate exists to prevent.
+
+      #933 fixed the drift: feedpak 1.15.0 RESERVES the stem id `full` for the
+      complete mixdown (feedpak-spec#53), and core now reads the full mix from
+      that stem. Nothing depends on this key any more — not the loader, not
+      lib/enrichment.py, not the stems plugin, and the packer no longer writes it.
+
+      What remains is a READ-ONLY deprecated fallback in lib/sloppak.py
+      (_legacy_full_mix), kept for one release because every pack produced before
+      the spec caught up carries `original_audio: original/full.ogg` and would
+      otherwise silently lose its pristine mix. tools/migrate_full_mix_stem.py
+      rewrites those packs into the spec shape.
+
+      This entry disappears with that fallback — tracked by #945, which cannot be
+      forgotten: the gate fails if the entry goes stale, and deleting the read is
+      what makes it stale.

lib/dlc_paths.py

@@ -14,6 +14,7 @@ import os
 from pathlib import Path
 
 import appstate
+from safepath import resolved_root
 
 
 def _get_dlc_dir(cfg: dict | None = None) -> Path | None:
@@ -86,7 +87,14 @@ def _resolve_dlc_path(dlc: Path, filename: str) -> Path | None:
             or PureWindowsPath(safe).drive):
         return None
     try:
-        root = dlc.resolve()
+        # The library root is fixed for the life of the process, but this
+        # function runs once per song / art fetch / scanned row — and
+        # `.resolve()` lstats every path component. Re-resolving here was
+        # ~23,500 stat calls/sec on a 50,944-song library, which pins a core
+        # when the library sits on a FUSE mount (NTFS-3G, SMB, sshfs) where each
+        # stat is a userspace round trip. Resolve the root once; see
+        # safepath.resolved_root for the caching contract.
+        root = resolved_root(dlc)
         # normpath collapses `.`/`..`/duplicate separators purely lexically —
         # it never touches the filesystem, so an in-library junction component
         # is preserved (allowed) while `..`/absolute segments still escape and

lib/enrichment.py

@@ -368,10 +368,12 @@ def _acoustid_gate() -> "JSONResponse | None":
 
 def _song_audio_file(filename: str) -> "str | None":
     """Resolve a LIBRARY song (by filename/id) to a local master-audio file for
-    fingerprinting: the full-mix `original_audio` extracted from a sloppak, or a
-    loose folder's audio. None when the song can't be found or ships no full-mix
-    audio (some packs carry only stems). Mirrors serve_sloppak_file's containment
-    guards so a crafted filename can't read outside DLC_DIR / the pack."""
+    fingerprinting: a sloppak's complete mixdown, or a loose folder's audio. None
+    when the song can't be found or carries no mixdown (a pack that kept only its
+    separated stems — an acoustic fingerprint of one re-summed from them would not
+    match the recording, so we decline rather than submit a lossy reconstruction).
+    Mirrors serve_sloppak_file's containment guards so a crafted filename can't
+    read outside DLC_DIR / the pack."""
     dlc = _get_dlc_dir()
     if not dlc:
         return None
@@ -383,7 +385,20 @@ def _song_audio_file(filename: str) -> "str | None":
             canon = resolved.relative_to(dlc.resolve()).as_posix()
         except ValueError:
             return None
-        rel = (sloppak_mod.load_manifest(resolved) or {}).get("original_audio")
+        manifest = sloppak_mod.load_manifest(resolved) or {}
+        # The mixdown is the RESERVED `full` stem (spec §5.3). Unlike playback,
+        # fingerprinting wants it even when it is the pack's ONLY stem — a
+        # single-mix pack is exactly the master audio we want to fingerprint —
+        # so this asks find_full_mix() rather than partition_stems().
+        stems = manifest.get("stems") or []
+        full = sloppak_mod.find_full_mix(
+            [s for s in stems if isinstance(s, dict)]
+        )
+        rel = full.get("file") if full else None
+        # DEPRECATED fallback: packs written before the spec reserved `full` put
+        # the mixdown behind a top-level `original_audio:` key instead (#933).
+        if not isinstance(rel, str) or not rel.strip():
+            rel = manifest.get("original_audio")
         if not isinstance(rel, str) or not rel.strip():
             return None
         src = sloppak_mod.get_cached_source_dir(canon)

lib/lyrics_transcribe.py

@@ -23,9 +23,18 @@ Engine selection
 Two transcription paths share a common output:
 
 * `transcribe_vocals_remote(path, server_url, ...)` — POST the vocal
-  stem to the `/align` endpoint on a feedBack-demucs-server (got-feedBack's
-  reference server already hosts WhisperX alongside Demucs at the same
-  URL).
+  stem to the `/transcribe` endpoint on a feedBack-demucs-server
+  (got-feedBack's reference server already hosts WhisperX alongside
+  Demucs at the same URL).
+
+  It used to POST to `/align`, which is *forced alignment* — "here are
+  the lyrics, tell me when each word is sung". Its `text` field is
+  required and we have no lyrics (transcribing them is the point), so
+  the server answered 422 from FastAPI's validation layer before its
+  handler ran, and remote transcription never worked for anyone
+  (feedBack-plugin-stem-splitter#17). `/transcribe` takes only audio.
+  Requires feedBack-demucs-server ≥ the revision adding that endpoint;
+  an older server answers 404 and the error says so.
 
 * `transcribe_vocals_local(path, ...)` — load WhisperX in-process. Heavy
   (~3 GB of model weights for `large-v2` + the wav2vec2 aligner) and
@@ -416,6 +425,38 @@ def transcribe_vocals_local(
 
 # ── Remote transcription ────────────────────────────────────────────────────
 
+_MAX_ERR_BODY = 4000
+
+
+def _err_body(resp) -> str:
+    """The server's error body, whole if it plausibly is one, and marked when it isn't.
+
+    This was capped at 300 chars, which is enough for "Internal Server Error" and not much else.
+    The bodies carrying the most diagnosis are the long ones — a FastAPI validation body naming
+    the field it rejected, a 500 whose traceback answers on its LAST line — and those are exactly
+    the ones a 300-char cap decapitates. The cap survives so a server answering with a 2 MB HTML
+    error page can't dump a novel into a log line.
+    """
+    # Strip FIRST, then measure: a body that is 300 chars of JSON and 3900 of trailing whitespace
+    # is not a long body, and truncating it would cut real content to make room for blanks.
+    text = (getattr(resp, "text", "") or "").strip()
+    if len(text) <= _MAX_ERR_BODY:
+        return text
+
+    # Keep the HEAD **and the TAIL**. Head-only truncation throws away the exception line — and
+    # on a traceback the exception line is the answer. This docstring said as much while the code
+    # did the opposite: it cut off precisely the part it exists to preserve, which is the same
+    # mistake, one level up, as the 300-char cap it replaced.
+    #
+    # The marker sits inside the bound, not past it: otherwise _MAX_ERR_BODY is a suggestion, and
+    # the callers who trust it (a log line, a job record persisted to disk) are the ones surprised.
+    marker = f"\n… [truncated, {len(text)} chars total] …\n"
+    budget = max(0, _MAX_ERR_BODY - len(marker))
+    head = budget * 2 // 3          # context: what was being attempted
+    tail = budget - head            # verdict: what actually went wrong
+    return text[:head].rstrip() + marker + text[len(text) - tail:].lstrip()
+
+
 def transcribe_vocals_remote(
     vocals_path: Path,
     server_url: str,
@@ -426,7 +467,17 @@ def transcribe_vocals_remote(
     min_word_score: float = 0.35,
     progress_cb: ProgressCB = None,
 ) -> list[dict]:
-    """POST the vocal stem to `{server_url}/align` and parse the response.
+    """POST the vocal stem to `{server_url}/transcribe` and parse the response.
+
+    NOT `/align` — that endpoint is forced alignment ("here are the lyrics,
+    tell me when each word is sung") and its `text` field is required. We
+    have no lyrics; producing them is the point. Posting there returned a
+    422 from FastAPI's validation layer before the server's handler ran, so
+    remote transcription never worked at all
+    (feedBack-plugin-stem-splitter#17).
+
+    Requires a feedBack-demucs-server carrying `/transcribe`; an older one
+    answers 404 and the raised error says so.
 
     Expects the server to respond with a JSON object carrying a `words` (or
     `segments`) field in WhisperX's native shape; `_whisperx_to_sloppak`
@@ -454,21 +505,53 @@ def transcribe_vocals_remote(
     if api_key:
         headers["Authorization"] = f"Bearer {api_key}"
 
-    params: dict[str, str] = {}
+    # POST to /transcribe, not /align.
+    #
+    # /align is FORCED ALIGNMENT: "here are the lyrics, tell me when each word is sung". Its
+    # `text` field is required, and we have no lyrics — transcription is the whole point. So the
+    # server rejected every request with a 422 in FastAPI's validation layer, before its handler
+    # ever ran, and remote transcription has never worked for anyone. /transcribe answers the
+    # question we are actually asking and takes only the audio.
+    # (feedBack-plugin-stem-splitter#17; endpoint added in feedBack-demucs-server#14.)
+    #
+    # `language` goes in the FORM BODY, not the query string: the server reads it with
+    # Form(""), and a query param would be silently ignored — so an explicit language hint would
+    # do nothing and Whisper's auto-detection would quietly decide instead, which is exactly the
+    # kind of "it works but it's wrong" that hides for months.
+    form: dict[str, str] = {}
     if language:
-        params["language"] = language
+        form["language"] = language
 
-    with open(vocals_path, "rb") as f:
-        resp = requests.post(
-            f"{server_url}/align",
-            files={"file": (vocals_path.name, f, "audio/ogg")},
-            params=params,
-            headers=headers or None,
-            timeout=timeout,
+    # Everything that can go wrong out here comes back as RuntimeError, which is what the
+    # docstring promises and what the caller catches. A DNS failure, a timeout, a reset
+    # connection or an unreadable stem file would otherwise surface as requests.RequestException
+    # or OSError and escape the one handler written to log-and-continue — turning "this song's
+    # lyrics failed" into "the whole batch died".
+    try:
+        with open(vocals_path, "rb") as f:
+            resp = requests.post(
+                f"{server_url}/transcribe",
+                files={"file": (vocals_path.name, f, "audio/ogg")},
+                data=form or None,
+                headers=headers or None,
+                timeout=timeout,
+            )
+    except requests.RequestException as e:
+        raise RuntimeError(f"could not reach the WhisperX server at {server_url}: {e}") from e
+    except OSError as e:
+        raise RuntimeError(f"could not read the vocal stem {vocals_path.name}: {e}") from e
+
+    if resp.status_code == 404:
+        # The endpoint isn't there. Say what that means, because "404" on its own sends someone
+        # hunting for a typo in their URL when the real answer is that their server predates the
+        # feature. (feedBack-demucs-server#14 added /transcribe.)
+        raise RuntimeError(
+            f"the WhisperX server at {server_url} has no /transcribe endpoint (404) — it "
+            f"predates remote transcription support. Update the server, or use 'Check for "
+            f"update' if it is the plugin-managed one."
         )
-
     if resp.status_code != 200:
-        raise RuntimeError(f"WhisperX server error ({resp.status_code}): {resp.text[:300]}")
+        raise RuntimeError(f"WhisperX server error ({resp.status_code}): {_err_body(resp)}")
 
     data = resp.json()
 

lib/metadata_db.py

@@ -614,6 +614,14 @@ class MetadataDB:
             )
         """)
         self.conn.execute("CREATE INDEX IF NOT EXISTS idx_song_stats_recent ON song_stats(last_played_at DESC)")
+        # Cumulative wall-clock play time (career "hours in genre" odometer).
+        # Fed by the same POST /api/stats the recorder already sends; additive
+        # + idempotent like every other song_stats change.
+        try:
+            self.conn.execute(
+                "ALTER TABLE song_stats ADD COLUMN seconds_total REAL NOT NULL DEFAULT 0")
+        except sqlite3.OperationalError:
+            pass
         # Playlists + the reserved "Saved for Later" system playlist. Additive.
         self.conn.execute("""
             CREATE TABLE IF NOT EXISTS playlists (
@@ -901,6 +909,9 @@ class MetadataDB:
                     "best_accuracy": max(cur["best_accuracy"] or 0.0, r["best_accuracy"] or 0.0),
                     "last_score": newer["last_score"], "last_accuracy": newer["last_accuracy"],
                     "last_position": newer["last_position"],
+                    # Play time is additive: both encodings' hours belong to
+                    # the one canonical song.
+                    "seconds_total": (cur.get("seconds_total") or 0.0) + (r.get("seconds_total") or 0.0),
                     "last_played_at": newer["last_played_at"], "updated_at": newer["updated_at"],
                 }
             # Atomic swap: clear and reinsert the canonicalized set in one txn.
@@ -1074,26 +1085,57 @@ class MetadataDB:
         vals["artist"], vals["title"] = self._romaji_display(filename, vals["artist"], vals["title"])
         return vals
 
-    # Effective genre = a per-song genre OVERRIDE (Fix-metadata popup) else the
-    # scanned pack genre. Applied at FILTER/FACET time (like the P4 artist alias)
-    # so a corrected genre is browsable — the correlated subquery is used ONLY
-    # when genre overrides actually exist; the common case stays on the plain
-    # indexed `genre` column. Genre stays a library-only overlay (it isn't a
-    # write-to-file field), so it never touches the pack.
-    _EFFECTIVE_GENRE_SQL = (
+    # Effective genre precedence: per-song OVERRIDE (Fix-metadata popup) →
+    # scanned pack genre → MusicBrainz enrichment primary genre (matched/manual rows
+    # only — a 'review'/'failed' candidate's genres could belong to the wrong
+    # recording). Applied at FILTER/FACET time (like the P4 artist alias) so a
+    # corrected or enriched genre is browsable. The vast majority of converted
+    # packs carry no `genres` manifest key, so without the enrichment leg the
+    # genre facet (and career passports) starve on real libraries. The
+    # correlated subqueries are used ONLY when overrides/enrichment genres
+    # actually exist; the common case stays on the plain indexed `genre`
+    # column. Genre stays a library-only overlay (it isn't a write-to-file
+    # field), so it never touches the pack.
+    _EFFECTIVE_GENRE_OVERRIDE_SQL = (
         "COALESCE((SELECT o.value FROM song_field_override o "
         "WHERE o.filename = songs.filename AND o.field = 'genre' "
         "AND o.value IS NOT NULL AND o.value != ''), genre)"
     )
+    _EFFECTIVE_GENRE_SQL = (
+        "COALESCE((SELECT o.value FROM song_field_override o "
+        "WHERE o.filename = songs.filename AND o.field = 'genre' "
+        "AND o.value IS NOT NULL AND o.value != ''), "
+        "NULLIF(genre, ''), "
+        "(SELECT json_extract(e.genres, '$[0]') FROM song_enrichment e "
+        "WHERE e.filename = songs.filename AND e.match_state IN ('matched', 'manual') "
+        "AND e.genres IS NOT NULL AND e.genres NOT IN ('', '[]')), "
+        "'')"
+    )
 
     def _has_genre_overrides(self) -> bool:
         return self.conn.execute(
             "SELECT 1 FROM song_field_override WHERE field = 'genre' "
             "AND value IS NOT NULL AND value != '' LIMIT 1").fetchone() is not None
 
+    def _has_enrichment_genres(self) -> bool:
+        try:
+            return self.conn.execute(
+                "SELECT 1 FROM song_enrichment WHERE match_state IN ('matched', 'manual') "
+                "AND genres IS NOT NULL AND genres NOT IN ('', '[]') "
+                "LIMIT 1").fetchone() is not None
+        except sqlite3.OperationalError:
+            return False  # stand-ins / DBs without the enrichment table
+
     def _effective_genre_expr(self) -> str:
-        """`genre` normally; the override-aware COALESCE only when overrides exist."""
-        return self._EFFECTIVE_GENRE_SQL if self._has_genre_overrides() else "genre"
+        """`genre` normally; the enrichment-aware COALESCE only when trusted
+        enrichment genres exist (which also proves the table exists — a
+        stand-in DB without song_enrichment must never receive SQL that
+        references it); the override-only form when just overrides exist."""
+        if self._has_enrichment_genres():
+            return self._EFFECTIVE_GENRE_SQL
+        if self._has_genre_overrides():
+            return self._EFFECTIVE_GENRE_OVERRIDE_SQL
+        return "genre"
 
     def set_song_tags(self, filename: str, tags) -> list:
         """Replace ALL of a song's tags with the given set (each normalized;
@@ -1693,7 +1735,8 @@ class MetadataDB:
     # ── Per-song practice stats ───────────────────────────────────────────---
     _STATS_COLS = (
         "filename", "arrangement", "plays", "best_score", "best_accuracy",
-        "last_score", "last_accuracy", "last_position", "last_played_at", "updated_at",
+        "last_score", "last_accuracy", "last_position", "seconds_total",
+        "last_played_at", "updated_at",
     )
 
     def _stats_row(self, filename: str, arrangement: int) -> dict | None:
@@ -2060,8 +2103,9 @@ class MetadataDB:
             self.conn.commit()
 
     def record_session(self, filename: str, arrangement: int, *, score: int,
-                       accuracy: float, last_position=None) -> dict:
-        """Record a scored play: plays += 1, best_* = max, last_* = new."""
+                       accuracy: float, last_position=None, seconds: float = 0) -> dict:
+        """Record a scored play: plays += 1, best_* = max, last_* = new.
+        `seconds` (wall-clock play time from the recorder) accrues."""
         from song_score import merge_stats
         with self._lock:
             existing = self._stats_row(filename, int(arrangement))
@@ -2071,8 +2115,9 @@ class MetadataDB:
             self.conn.execute(
                 """INSERT INTO song_stats
                        (filename, arrangement, plays, best_score, best_accuracy,
-                        last_score, last_accuracy, last_position, last_played_at, updated_at)
-                   VALUES (?, ?, ?, ?, ?, ?, ?, ?,
+                        last_score, last_accuracy, last_position, seconds_total,
+                        last_played_at, updated_at)
+                   VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?,
                            strftime('%Y-%m-%d %H:%M:%f','now'), strftime('%Y-%m-%d %H:%M:%f','now'))
                    ON CONFLICT(filename, arrangement) DO UPDATE SET
                        plays = excluded.plays,
@@ -2081,32 +2126,62 @@ class MetadataDB:
                        last_score = excluded.last_score,
                        last_accuracy = excluded.last_accuracy,
                        last_position = excluded.last_position,
+                       seconds_total = song_stats.seconds_total + excluded.seconds_total,
                        last_played_at = excluded.last_played_at,
                        updated_at = excluded.updated_at""",
                 (filename, int(arrangement), merged["plays"], merged["best_score"],
                  merged["best_accuracy"], merged["last_score"], merged["last_accuracy"],
-                 merged["last_position"]),
+                 merged["last_position"], float(seconds or 0)),
             )
             self.conn.commit()
         return self._stats_row(filename, int(arrangement))
 
-    def touch_position(self, filename: str, arrangement: int, last_position: float) -> dict:
+    def touch_position(self, filename: str, arrangement: int, last_position: float,
+                       seconds: float = 0) -> dict:
         """Persist just the resume position (no plays/score change), so
         Continue-Playing works for non-scored plays. Also stamps
         last_played_at — both /api/stats/recent and /api/session/continue
         filter/order on it, so a position-only touch must set it or the song
-        never surfaces as 'recent' / 'continue playing'."""
+        never surfaces as 'recent' / 'continue playing'. `seconds` accrues
+        wall-clock play time (career hours odometer)."""
         with self._lock:
             self.conn.execute(
                 """INSERT INTO song_stats (filename, arrangement, last_position,
+                                           seconds_total, last_played_at, updated_at)
+                   VALUES (?, ?, ?, ?, strftime('%Y-%m-%d %H:%M:%f','now'),
+                           strftime('%Y-%m-%d %H:%M:%f','now'))
+                   ON CONFLICT(filename, arrangement) DO UPDATE SET
+                       last_position = excluded.last_position,
+                       seconds_total = song_stats.seconds_total + excluded.seconds_total,
+                       last_played_at = excluded.last_played_at,
+                       updated_at = excluded.updated_at""",
+                (filename, int(arrangement), float(last_position), float(seconds or 0)),
+            )
+            self.conn.commit()
+        return self._stats_row(filename, int(arrangement))
+
+    def add_play_seconds(self, filename: str, arrangement: int, seconds: float) -> dict:
+        """Accrue wall-clock play time (no plays/score/position change) —
+        the recorder's seconds-only flush for unscored plays that ran to the
+        song's natural end (no resume position to touch there: `song:ended`
+        must not overwrite Continue with the end-of-song offset). Stamps
+        last_played_at like touch_position does: the song WAS played, so
+        /api/stats/recent and Continue ordering must see it. Accepted skew:
+        the recorder retries FAILED flushes later, which stamps recency at
+        retry time — rare (offline corner), self-healing on the next play,
+        and preferable to the alternative (keep-existing would leave repeat
+        plays looking stale, the common case)."""
+        with self._lock:
+            self.conn.execute(
+                """INSERT INTO song_stats (filename, arrangement, seconds_total,
                                            last_played_at, updated_at)
                    VALUES (?, ?, ?, strftime('%Y-%m-%d %H:%M:%f','now'),
                            strftime('%Y-%m-%d %H:%M:%f','now'))
                    ON CONFLICT(filename, arrangement) DO UPDATE SET
-                       last_position = excluded.last_position,
+                       seconds_total = song_stats.seconds_total + excluded.seconds_total,
                        last_played_at = excluded.last_played_at,
                        updated_at = excluded.updated_at""",
-                (filename, int(arrangement), float(last_position)),
+                (filename, int(arrangement), float(seconds)),
             )
             self.conn.commit()
         return self._stats_row(filename, int(arrangement))

lib/routers/stats.py

@@ -76,6 +76,22 @@ def api_record_stats(data: dict):
     last_pos = data.get("lastPlayPosition", data.get("last_position"))
     if isinstance(last_pos, bool):   # float(False)=0.0 would otherwise store a bogus position
         return JSONResponse({"error": "lastPlayPosition must be a finite number"}, status_code=400)
+    # Optional wall-clock play time (career hours odometer). Bounded per POST:
+    # the recorder flushes on pause/stop/end, so a single delta beyond 6h is a
+    # clock artifact (suspend/sleep), not practice.
+    seconds = data.get("seconds")
+    if seconds is not None:
+        if isinstance(seconds, bool):
+            return JSONResponse({"error": "seconds must be a positive number"}, status_code=400)
+        try:
+            seconds = float(seconds)
+            if not math.isfinite(seconds):
+                raise ValueError("non-finite")
+        except (TypeError, ValueError, OverflowError):
+            return JSONResponse({"error": "seconds must be a positive number"}, status_code=400)
+        if not (0 < seconds <= 6 * 3600):
+            return JSONResponse({"error": "seconds must be between 0 and 21600"}, status_code=400)
+    seconds = seconds or 0.0
 
     # A scored session needs BOTH score and accuracy. Exactly one provided is
     # ambiguous — don't silently fall through to the position-only branch.
@@ -115,7 +131,8 @@ def api_record_stats(data: dict):
             except (TypeError, ValueError, OverflowError):
                 return JSONResponse({"error": "lastPlayPosition must be a finite number"}, status_code=400)
         row = appstate.meta_db.record_session(filename, arrangement, score=score,
-                                     accuracy=accuracy, last_position=last_pos)
+                                     accuracy=accuracy, last_position=last_pos,
+                                     seconds=seconds)
         # Unified XP + streak side-effects — never let these drop the stat write.
         progress = None
         try:
@@ -152,6 +169,21 @@ def api_record_stats(data: dict):
             log.warning("stats side-effects (progression) failed", exc_info=True)
         return {"stats": row, "progress": progress, "progression": progression_summary}
 
+    # Seconds-only accrual: an unscored play that ran to the song's natural
+    # end has play time to bank but no resume position to touch (song:ended
+    # must not overwrite Continue with the end-of-song offset). Still counts
+    # as playing today for the streak below.
+    if last_pos is None and seconds:
+        row = appstate.meta_db.add_play_seconds(filename, arrangement, seconds)
+        progress = None
+        try:
+            from datetime import date
+            appstate.meta_db.record_active_day(date.today().isoformat())
+            progress = appstate.meta_db.get_progress()
+        except Exception:
+            log.warning("stats side-effects (streak) failed", exc_info=True)
+        return {"stats": row, "progress": progress}
+
     # Position-only touch.
     if last_pos is None:
         return JSONResponse(
@@ -162,7 +194,7 @@ def api_record_stats(data: dict):
         pos = float(last_pos)
         if not math.isfinite(pos):
             raise ValueError("non-finite")
-        row = appstate.meta_db.touch_position(filename, arrangement, pos)
+        row = appstate.meta_db.touch_position(filename, arrangement, pos, seconds=seconds)
     except (TypeError, ValueError, OverflowError):
         return JSONResponse({"error": "lastPlayPosition must be a finite number"}, status_code=400)
     # A resume session still counts as playing today: advance the streak (no XP —

lib/routers/ws_highway.py

@@ -321,11 +321,16 @@ async def highway_ws(websocket: WebSocket, filename: str, arrangement: int = -1,
         audio_url = None
         audio_error: str | None = None  # Surfaced in song_info when audio_url is None
         stems_payload: list[dict] = []
-        # URL of the single full-mix audio (sloppak `original_audio:`), when the
-        # pack ships one. The stems plugin uses this to play the untouched mix
-        # while every stem slider is at unity; None otherwise (separate stems
-        # only, loose folder, or archive).
-        original_audio_url: str | None = None
+        # URL of the pack's complete mixdown — the RESERVED `full` stem (spec
+        # §5.3), which sloppak.load_song() lifts out of `stems` because it is a
+        # mixdown, not a layer. The stems plugin plays it while every stem slider
+        # is at unity (separation is lossy, so it beats re-summing the stems) and
+        # crosses to the separated stems as soon as one is attenuated.
+        #
+        # None when the pack has no mixdown to offer separately from its stems:
+        # a single-mix pack (its one stem IS the mixdown), a loose folder, or an
+        # archive.
+        full_mix_url: str | None = None
         if is_loose:
             # Loose folder filenames are relative paths (artist/album/song).
             # Hash the *canonical* dlc-relative path (so two URL spellings
@@ -365,21 +370,25 @@ async def highway_ws(websocket: WebSocket, filename: str, arrangement: int = -1,
                 url = f"/api/sloppak/{q_fn}/file/{quote(s['file'])}"
                 stems_payload.append({"id": s["id"], "url": url, "default": s["default"]})
             # Full-mix URL (served by the same /api/sloppak/.../file/ endpoint).
-            if loaded_slop is not None and loaded_slop.original_audio:
-                original_audio_url = (
-                    f"/api/sloppak/{q_fn}/file/{quote(loaded_slop.original_audio)}"
+            if loaded_slop is not None and loaded_slop.full_mix:
+                full_mix_url = (
+                    f"/api/sloppak/{q_fn}/file/{quote(loaded_slop.full_mix)}"
                 )
             if stems_payload:
                 # Stems present: keep the core <audio> pointed at stem[0]. This
                 # URL is only ever heard in the degraded path (stems plugin
                 # refuses takeover / decode fails); the full-mix↔stems switch is
-                # driven client-side by `original_audio_url`, not `audio_url`.
+                # driven client-side by `full_mix_url`, not `audio_url`.
                 audio_url = stems_payload[0]["url"]
-            elif original_audio_url:
+            elif full_mix_url:
                 # Stem-less full-mix pack: nothing to separate, so play the full
                 # mix natively through the core <audio>. The stems plugin's
                 # onSongReady returns early on an empty stems list (no graph).
-                audio_url = original_audio_url
+                # Reachable only via the deprecated `original_audio:` key, whose
+                # packs put the mixdown outside `stems` — a pack that carries its
+                # mixdown as the `full` stem has it IN `stems`, so it lands in the
+                # branch above with stems_payload == [full].
+                audio_url = full_mix_url
             else:
                 audio_error = "This sloppak has no playable stems."
         else:
@@ -521,16 +530,31 @@ async def highway_ws(websocket: WebSocket, filename: str, arrangement: int = -1,
             # for the credits overlay, so minigames / synthetic highway uses
             # (no manifest) never trigger it.
             "authors": _sanitize_authors(loaded_slop.manifest) if (is_slop and loaded_slop is not None) else [],
+            # Instrument stems ONLY. The pack's complete mixdown (the RESERVED
+            # `full` stem, spec §5.3) is deliberately NOT in this list: consumers
+            # sum `stems` into one mix and render one fader per entry, and the
+            # mixdown is neither a layer nor an instrument — summing it would
+            # double the whole song. It is surfaced separately, below.
             "stems": stems_payload,
-            # Full-mix audio (sloppak `original_audio:`) served alongside the
-            # separate `stems`. The stems plugin plays this single file while
-            # every stem slider is at unity and switches to the separate stems
-            # the moment one drops below 100%. None when the pack ships stems
-            # only. `has_*` flags mirror the has_drum_tab/has_keys convention so
-            # a client can branch without re-deriving from the URLs.
-            "original_audio_url": original_audio_url,
-            "has_original_audio": bool(original_audio_url),
+            # The complete mixdown, served by the same /api/sloppak/.../file/
+            # endpoint as the stems. The stems plugin plays this single file
+            # while every stem slider is at unity and crosses to the separated
+            # stems the moment one drops below 100% — separation is lossy, so the
+            # mixdown is strictly better audio when nothing is muted. None when
+            # the pack has no mixdown apart from its stems. The `has_*` flags
+            # mirror the has_drum_tab/has_keys convention so a client can branch
+            # without re-deriving from the URLs.
+            "full_mix_url": full_mix_url,
+            "has_full_mix": bool(full_mix_url),
             "has_stems": bool(stems_payload),
+            # DEPRECATED aliases of the two keys above, kept so a client built
+            # against the old frame keeps working across one release. They were
+            # named after `original_audio:` — a manifest key this repo invented
+            # and the feedpak spec never had (#933). The key is gone; the mixdown
+            # is a stem. Remove these once the shipped stems plugin reads
+            # `full_mix_url` (#945).
+            "original_audio_url": full_mix_url,
+            "has_original_audio": bool(full_mix_url),
             # Surface a drum_tab presence flag so the visualization picker
             # can auto-activate the drums plugin even when the chosen
             # arrangement isn't named "Drums" (drum_tab.json lives next

lib/safepath.py

@@ -4,9 +4,34 @@ under a server-owned root.
 
 from __future__ import annotations
 
+from functools import lru_cache
 from pathlib import Path
 
 
+@lru_cache(maxsize=16)
+def resolved_root(root: Path) -> Path:
+    """Canonical (link-resolved) form of a server-owned root directory.
+
+    ``Path.resolve()`` is a filesystem call: it lstats every component of the
+    path. The roots we join against — the DLC library, a plugin's asset dir —
+    are fixed for the life of the process, but the containment helpers below
+    (and ``dlc_paths._resolve_dlc_path``) were re-resolving them on EVERY call,
+    and those are called once per song, per art fetch, per scanned row.
+
+    On a real 50,944-song library that cost ~23,500 stat/lstat calls per second,
+    pinning a core. It is brutal when the library lives on a FUSE mount
+    (NTFS-3G, SMB, sshfs), where every stat is a userspace round trip: the same
+    three parent directories were being walked over and over.
+
+    Cached because a root is a constant here, not because resolution is cheap.
+    Consequence: if a root's symlink/junction is re-pointed at a NEW target
+    while the server is running, the old target stays in effect until restart.
+    That is fine for a library path fixed at startup, and the cache is keyed on
+    the Path, so switching to a different library dir is a different key.
+    """
+    return root.resolve()
+
+
 def safe_join(root: Path, name: str) -> Path | None:
     """Resolve ``name`` under ``root`` and return the resolved Path, or
     ``None`` if it would escape ``root`` or is unrepresentable.
@@ -35,9 +60,12 @@ def safe_join(root: Path, name: str) -> Path | None:
         return None
     safe = name.replace("\\", "/")
     try:
-        root_resolved = root.resolve()
-        candidate = (root_resolved / safe).resolve()
-        if not candidate.is_relative_to(root_resolved):
+        # The ROOT is a constant — resolve it once (see resolved_root). The
+        # CANDIDATE must still be resolved on every call: following its symlinks
+        # is exactly the zip-slip / traversal defence, so it is never cached.
+        root_res = resolved_root(root)
+        candidate = (root_res / safe).resolve()
+        if not candidate.is_relative_to(root_res):
             return None
     except (ValueError, OSError):
         return None

lib/sloppak.py

@@ -15,6 +15,7 @@ from __future__ import annotations
 
 import logging
 import math
+import os
 import shutil
 import threading
 import zipfile
@@ -34,6 +35,21 @@ FEEDPAK_EXT = ".feedpak"
 SLOPPAK_EXT = ".sloppak"
 SONG_EXTS = (FEEDPAK_EXT, SLOPPAK_EXT)  # accepted on read/discovery
 
+# ── The full mix ──────────────────────────────────────────────────────────────
+#
+# Spec §5.3 RESERVES the stem id `full` for the song's complete mixdown: the
+# whole song in one file, as heard before source separation. It is a stem — it
+# lives in `stems` like every other audio file in a pack — but it is a *mixdown,
+# not a layer*. A reader that sums stems must never include it in the sum: it
+# already contains every instrument, so summing it doubles the whole song and
+# muting `guitar` still leaves guitar audible inside it.
+#
+# Keeping it matters because separation is lossy: re-summing guitar+bass+drums+
+# vocals does NOT reproduce the file they came from. The mixdown is the only
+# faithful rendering of the song a pack can carry, so we play it whenever every
+# stem sits at unity and nothing is muted.
+FULL_MIX_STEM_ID = "full"
+
 import yaml
 
 from jsonc import load_json
@@ -51,6 +67,97 @@ import drums as drums_mod
 import notation as notation_mod
 
 
+def find_full_mix(stems: list[dict]) -> dict | None:
+    """The RESERVED `full` stem (spec §5.3) — the pack's complete mixdown — or None.
+
+    Answers "what is this pack's master audio", which is what fingerprinting
+    wants. For playback use partition_stems() instead: a pack whose *only* stem
+    is `full` has no mixdown to play *separately from* its stems, and this
+    function still returns it.
+    """
+    return next(
+        (s for s in stems if str(s.get("id", "")) == FULL_MIX_STEM_ID), None
+    )
+
+
+def partition_stems(stems: list[dict]) -> tuple[dict | None, list[dict]]:
+    """Split stem descriptors into (mixdown, instrument_stems) for PLAYBACK.
+
+    The mixdown is lifted OUT of the stem list because every consumer of `stems`
+    treats that list as layers to sum or to show as mixer channels, and `full` is
+    neither (spec §5.3). Leaving it in is precisely the bug that made the packer
+    invent `original_audio` in the first place: a listed full mix plays on top of
+    the stems.
+
+    A pack whose only stem is `full` is a single-mix pack, not a separated one:
+    there are no instruments to be pristine *against*, so `full` stays the sole
+    playable stem and no mixdown is surfaced. That keeps the freshly-converted
+    single-stem pack — much the most common shape — behaving exactly as before.
+
+    EVERY entry with the reserved id is removed, not just the one we surface. A
+    malformed pack that lists `full` twice would otherwise leave a copy of the
+    whole song behind in the stem list, to be summed with the instruments — the
+    precise failure this function exists to prevent, reintroduced by a duplicate.
+    """
+    if len(stems) < 2:
+        return None, stems
+    full = find_full_mix(stems)
+    if full is None:
+        return None, stems
+    return full, [s for s in stems if str(s.get("id", "")) != FULL_MIX_STEM_ID]
+
+
+def _legacy_full_mix(manifest: dict, source_dir: Path) -> str | None:
+    """Full mix from the DEPRECATED `original_audio:` manifest key, or None.
+
+    Before feedpak 1.15.0 reserved `full`, §5.3 said the mixdown was "commonly
+    replaced" by the per-instrument stems on splitting — so it had nowhere to
+    live, and this repo invented a top-level key pointing at a parallel
+    `original/` directory (#583) to hold it. That key was never in the spec, and
+    #933 removed our dependence on it: the mixdown is a stem.
+
+    We still READ it, because every pack written before the spec caught up
+    carries `original_audio: original/full.ogg` and would otherwise lose its full
+    mix. We never write it. Delete this once those packs are migrated (#945);
+    `tools/migrate_full_mix_stem.py` is the migration.
+
+    NOTE the string literal below. tools/check_spec_conformance.py AST-scans for
+    `manifest.get("<literal>")` to prove every manifest key core reads is one the
+    spec declares. Hoisting "original_audio" into a named constant would hide
+    this read from that scan — the gate would conclude core no longer touches the
+    key, and the grandfather entry that documents this debt would go stale. The
+    literal is what keeps the deprecation honest and visible to CI. Leave it.
+
+    Same permissive, path-traversal-guarded posture as the optional side-files: a
+    missing / escaping / unreadable file leaves the pack without a full mix (the
+    player falls back to the separated stems) rather than aborting the load.
+    Returns the manifest-relative string, so callers build its URL exactly as
+    they build a stem's.
+    """
+    rel_raw = manifest.get("original_audio")
+    if not isinstance(rel_raw, str) or not rel_raw.strip():
+        return None
+    rel = rel_raw.strip()
+    try:
+        target = (source_dir / rel).resolve()
+        target.relative_to(source_dir.resolve())
+    except ValueError:
+        log.warning("sloppak: original_audio path %r escapes source_dir — skipped", rel)
+        return None
+    except OSError as e:
+        log.warning("sloppak: original_audio path resolution failed (%s) — skipped", e)
+        return None
+    if not target.is_file():
+        return None
+    log.info(
+        "sloppak: pack uses the deprecated `original_audio:` key (%r) — the full mix "
+        "is a stem (id `full`, feedpak spec §5.3). Re-pack with "
+        "tools/migrate_full_mix_stem.py; support for this key will be removed.",
+        rel,
+    )
+    return rel
+
+
 # ── Format detection ──────────────────────────────────────────────────────────
 
 def is_sloppak(path: Path) -> bool:
@@ -81,6 +188,116 @@ _unpack_semaphore = threading.BoundedSemaphore(_UNPACK_MAX_CONCURRENCY)
 _unpack_locks: dict[str, threading.Lock] = {}
 _unpack_locks_guard = threading.Lock()
 
+# Destinations with an unpack in flight right now. Eviction MUST skip these: two
+# unpacks run concurrently, so one finishing could otherwise rmtree the other's
+# half-written directory and leave that resolver caching an incomplete song.
+_unpacking: set[Path] = set()
+_unpacking_guard = threading.Lock()
+
+# Cap the unpack cache. Stems are already-compressed audio, so an unpacked song
+# is ~1.1x its zip — the cache is effectively a second, DECOMPRESSED copy of
+# every song it holds, and it used to grow without any bound at all. A tester
+# reached 60 GB from a 1800-song library: their whole library, unpacked, because
+# one caller looped the library calling load_song(). Nothing ever deleted any of
+# it — not even when the song itself was deleted.
+#
+# Default 4 GB ≈ 130 average songs of recency, which is far more than the "the
+# song I'm playing, and the last few I played" that this cache actually exists
+# to serve. Override with FEEDBACK_SLOPPAK_CACHE_MAX_MB (0 disables eviction).
+def _unpack_cache_cap_bytes() -> int:
+    raw = os.environ.get("FEEDBACK_SLOPPAK_CACHE_MAX_MB", "").strip()
+    try:
+        mb = int(raw) if raw else 4096
+    except ValueError:
+        mb = 4096
+    return max(0, mb) * 1024 * 1024
+
+
+def _dir_size(path: Path) -> int:
+    total = 0
+    for f in path.rglob("*"):
+        try:
+            if f.is_file():
+                total += f.stat().st_size
+        except OSError:
+            continue
+    return total
+
+
+def _touch(path: Path) -> None:
+    """Bump mtime so the LRU sweep below treats this song as recently used.
+
+    Reading files out of an unpacked dir doesn't change the DIRECTORY's mtime,
+    so without this the song you are actively playing looks as stale as one you
+    unpacked days ago — and a burst of unpacks could evict it mid-song.
+    """
+    try:
+        os.utime(path, None)
+    except OSError:
+        pass
+
+
+def _evict_unpack_cache(root: Path, keep: Path | None = None) -> None:
+    """Bound the unpack cache: drop least-recently-used songs until under the cap.
+
+    `keep` is never evicted — it's the song the caller just resolved, i.e. almost
+    certainly the one about to be played.
+
+    Evicting a directory MUST also drop its `_source_cache` entry. Otherwise
+    get_cached_source_dir() keeps handing out a path that no longer exists and
+    the media route 404s on every stem instead of re-unpacking (it only falls
+    back to resolve_source_dir when the cache returns None).
+    """
+    cap = _unpack_cache_cap_bytes()
+    if cap <= 0:
+        return
+    try:
+        entries = []
+        total = 0
+        for d in root.iterdir():
+            if not d.is_dir():
+                continue
+            try:
+                size = _dir_size(d)
+                mtime = d.stat().st_mtime
+            except OSError:
+                continue
+            entries.append((mtime, size, d))
+            total += size
+        if total <= cap:
+            return
+
+        keep_resolved = keep.resolve() if keep else None
+        entries.sort(key=lambda e: e[0])          # oldest first
+        for _mtime, size, d in entries:
+            if total <= cap:
+                break
+            try:
+                if keep_resolved and d.resolve() == keep_resolved:
+                    continue
+            except OSError:
+                continue
+            # Check-and-delete under ONE hold of the guard. Releasing between the
+            # two would let a resolver mark this dest in-flight and start writing
+            # into it in the gap, and we'd rmtree a song mid-unpack. A resolver
+            # that blocks here simply proceeds afterwards — _unpack_zip recreates
+            # the directory anyway.
+            with _unpacking_guard:
+                if d in _unpacking:
+                    continue                      # another thread is writing this
+                shutil.rmtree(d, ignore_errors=True)
+            if d.exists():
+                continue                          # couldn't remove — don't claim the bytes back
+            total -= size
+            with _source_lock:
+                for fn, (cached_dir, _m, _s) in list(_source_cache.items()):
+                    if cached_dir == d:
+                        _source_cache.pop(fn, None)
+            log.info("sloppak: evicted %s from the unpack cache (%.0f MB)",
+                     d.name, size / 1e6)
+    except OSError:
+        log.warning("sloppak: unpack-cache eviction failed", exc_info=True)
+
 
 def _unpack_lock_for(filename: str) -> threading.Lock:
     """Return a stable per-file lock so concurrent unpacks of the same sloppak
@@ -145,10 +362,17 @@ def resolve_source_dir(
                       re-unpacks if mtime/size changed, then returns that dir.
 
     Caches the resolution so subsequent calls are ~free.
+
+    NOTE: this writes the WHOLE pack — every stem — to disk. Only call it for a
+    song you are about to play. To read a *part* of a song (an arrangement, the
+    lyrics, a tone blob), use read_member_bytes(): unpacking a pack to read a few
+    KB of JSON is ~45x write amplification, and doing it in a loop over the
+    library fills the disk with a decompressed copy of every song.
     """
     path = dlc_root / filename
     stat = path.stat()
     mtime, size = stat.st_mtime, stat.st_size
+    guarded: Path | None = None   # a dir WE unpacked, shielded from eviction
 
     with _source_lock:
         cached = _source_cache.get(filename)
@@ -159,42 +383,76 @@ def resolve_source_dir(
                 and cached_size == size
                 and cached_dir.exists()
             ):
+                # Mark it recently-used before returning — see _touch().
+                if cached_dir != path:
+                    _touch(cached_dir)
                 return cached_dir
 
-    if path.is_dir():
-        resolved = path
-    else:
-        # Zip form — unpack to the cache. Serialize per-file (so concurrent
-        # callers don't rmtree + re-extract the same dest at once) and cap
-        # global unpack concurrency (so a burst can't saturate disk/CPU).
-        dest = unpack_cache_root / _safe_id(filename)
-        with _unpack_lock_for(filename):
-            # Re-check the cache inside the per-file lock — a prior holder may
-            # have just finished unpacking this exact (mtime, size).
-            with _source_lock:
-                cached = _source_cache.get(filename)
-            if (
-                cached
-                and cached[1] == mtime
-                and cached[2] == size
-                and cached[0].exists()
-            ):
-                resolved = cached[0]
-            else:
-                with _unpack_semaphore:
-                    _unpack_zip(path, dest)
-                resolved = dest
+    try:
+        if path.is_dir():
+            resolved = path
+        else:
+            # Zip form — unpack to the cache. Serialize per-file (so concurrent
+            # callers don't rmtree + re-extract the same dest at once) and cap
+            # global unpack concurrency (so a burst can't saturate disk/CPU).
+            dest = unpack_cache_root / _safe_id(filename)
+            with _unpack_lock_for(filename):
+                # Re-check the cache inside the per-file lock — a prior holder may
+                # have just finished unpacking this exact (mtime, size).
+                with _source_lock:
+                    cached = _source_cache.get(filename)
+                if (
+                    cached
+                    and cached[1] == mtime
+                    and cached[2] == size
+                    and cached[0].exists()
+                ):
+                    resolved = cached[0]
+                else:
+                    # Shield `dest` from eviction from the moment we start writing
+                    # until it is safely in _source_cache. `keep` only shields it
+                    # from OUR OWN sweep — a concurrent resolver sweeping with a
+                    # different `keep` would delete it, and we would then cache and
+                    # return a path that no longer exists. The `finally` below
+                    # releases it on EVERY exit, including a failed unpack: leaving
+                    # a dest marked in-flight would make it un-evictable forever.
+                    with _unpacking_guard:
+                        _unpacking.add(dest)
+                    guarded = dest
+                    with _unpack_semaphore:
+                        _unpack_zip(path, dest)
+                    resolved = dest
+                    # The only moment this cache grows. Sweep here rather than on a
+                    # timer so it can never drift far past the cap.
+                    _evict_unpack_cache(unpack_cache_root, keep=dest)
 
-    with _source_lock:
-        _source_cache[filename] = (resolved, mtime, size)
-    return resolved
+        with _source_lock:
+            _source_cache[filename] = (resolved, mtime, size)
+        return resolved
+    finally:
+        if guarded is not None:
+            with _unpacking_guard:
+                _unpacking.discard(guarded)
 
 
 def get_cached_source_dir(filename: str) -> Path | None:
-    """Return the cached source dir for a sloppak if one is known."""
+    """Return the cached source dir for a sloppak if one is known AND still there.
+
+    The existence check is load-bearing: callers (media.py) only fall back to
+    resolve_source_dir() when this returns None, so handing back a path that has
+    been evicted — or that the user deleted by hand to reclaim disk — would 404
+    every stem for the rest of the process instead of re-unpacking.
+    """
     with _source_lock:
         cached = _source_cache.get(filename)
-        return cached[0] if cached else None
+        if not cached:
+            return None
+        src = cached[0]
+        if not src.is_dir():
+            _source_cache.pop(filename, None)
+            return None
+        _touch(src)
+        return src
 
 
 # ── Manifest + song loading ───────────────────────────────────────────────────
@@ -233,6 +491,82 @@ def load_manifest(path: Path) -> dict:
     return _read_manifest_from_zip(path)
 
 
+_ZIP_ROOT = Path("/_root").resolve()
+
+
+def _zip_member_key(name: str) -> str | None:
+    """Canonical lookup key for a zip member name, or None if it escapes the root.
+
+    Collapses './', 'a/../b' and backslash separators — the same normalization
+    _unpack_zip()/safe_join() apply when extracting. Both the name the caller asks
+    for AND the names the archive actually stores must go through this, or a pack
+    that stores './arrangements/lead.json' unpacks fine but reads back as missing.
+    """
+    safe = safe_join(_ZIP_ROOT, name or "")
+    # None → escapes the root; == root → a degenerate name like "." or "a/..".
+    if safe is None or safe == _ZIP_ROOT:
+        return None
+    return safe.relative_to(_ZIP_ROOT).as_posix()
+
+
+def read_member_bytes(path: Path, rel: str) -> bytes | None:
+    """Return the bytes of ONE file inside a sloppak, or None if it isn't there.
+
+    For a zipped sloppak this opens that single member instead of unpacking the
+    archive — the same trick read_cover_bytes() uses to keep the library grid
+    from exploding every pack just to show a cover.
+
+    Reach for this whenever you want a *part* of a song (an arrangement's JSON,
+    the lyrics, a tone blob) rather than a song you're about to play. The
+    alternative, load_song(), calls resolve_source_dir() and writes the WHOLE
+    pack — every stem — into the unpack cache. That is a ~45x write amplification
+    when all you wanted was a few KB of JSON, and looping the library on it
+    unpacks the entire library (got-feedBack/feedBack: a tester hit 60 GB that
+    way). Stems are already-compressed audio, so an unpacked song is ~1.1x its
+    zip: the cache becomes a second, decompressed copy of everything it touches.
+    """
+    rel = (rel or "").strip()
+    if not rel:
+        return None
+
+    if path.is_dir():
+        target = safe_join(path.resolve(), rel)
+        if target is None or not target.is_file():
+            return None
+        try:
+            return target.read_bytes()
+        except OSError:
+            return None
+
+    # Zip form — read just that member, no unpack. Zip-slip is rejected before we
+    # open anything, and both sides of the comparison are normalized, so a
+    # non-canonical-but-valid name ('./arrangements/lead.json') resolves the same
+    # way it did when we unpacked first.
+    member = _zip_member_key(rel)
+    if member is None:
+        log.warning("sloppak: rejected unsafe member name %r in %r", rel, path)
+        return None
+    try:
+        with zipfile.ZipFile(str(path), "r") as zf:
+            # Match on the NORMALIZED stored name, and take the LAST match — the
+            # archive may store './x' or a backslash path (Windows tooling), and
+            # if it stores two names that normalize to the same file, _unpack_zip
+            # writes them in order so the last one wins. Reading the raw member by
+            # exact name would miss the first case and return the wrong bytes in
+            # the second. A pack has a handful of members; the scan is free.
+            info = None
+            for cand in zf.infolist():
+                if _zip_member_key(cand.filename) == member:
+                    info = cand
+            if info is None or info.is_dir():
+                return None
+            with zf.open(info) as f:
+                return f.read()
+    except (zipfile.BadZipFile, OSError, RuntimeError) as e:
+        log.warning("sloppak: failed to read %r from %s: %s", rel, path.name, e)
+        return None
+
+
 _COVER_MEDIA_TYPES = {
     ".jpg": "image/jpeg", ".jpeg": "image/jpeg",
     ".png": "image/png", ".webp": "image/webp",
@@ -367,14 +701,21 @@ class LoadedSloppak:
     # song.arrangements (not to manifest["arrangements"]) — skipped entries are
     # absent so indexing by song.arrangements index is safe.
     arrangement_ids: list[str | None] = field(default_factory=list)
-    # Manifest-relative path to the single full-mix audio file, taken from the
-    # manifest `original_audio:` key (e.g. "original/full.ogg"). This is the
-    # pre-separation mixdown that exists alongside the per-instrument `stems`.
-    # None when the key is absent, points outside source_dir, or the file is
-    # missing on disk. Served to the front-end via the highway WS as
-    # `original_audio_url`; the stems plugin uses it to play the untouched mix
-    # when every stem slider is at unity (and the separate stems otherwise).
-    original_audio: str | None = None
+    # Manifest-relative path to the pack's complete mixdown — the whole song in
+    # one file, as heard before source separation. This is the RESERVED `full`
+    # stem (spec §5.3), lifted out of `stems` above precisely because it is NOT
+    # an instrument layer: summing it with the per-instrument stems it was split
+    # into would double the entire song. See partition_stems().
+    #
+    # None when the pack has no mixdown to offer *separately* from its stems —
+    # which includes the common single-mix pack, whose only stem IS the mixdown
+    # (there is nothing to be pristine against, so it stays in `stems`).
+    #
+    # Served to the front-end via the highway WS as `full_mix_url`; the stems
+    # plugin plays it while every stem slider sits at unity and crosses to the
+    # separated stems the moment one drops below 100% — demucs recombination is
+    # lossy, so the mixdown is strictly the better audio when nothing is muted.
+    full_mix: str | None = None
 
 
 def load_song(
@@ -766,6 +1107,13 @@ def load_song(
             default_on = bool(default_val)
         stems.append({"id": sid, "file": sfile, "default": default_on})
 
+    # The complete mixdown is a stem (spec §5.3), but it is not a *layer*: lift
+    # it out so that no consumer of `stems` — the mixer, the library's stem
+    # chips, the WS payload — sums it with, or lists it beside, the instruments
+    # it was separated into. `full_mix_stem` is None for a single-mix pack,
+    # whose only stem IS the mixdown and stays in the list.
+    full_mix_stem, stems = partition_stems(stems)
+
     # Optional keys.json — song-level, instrument-independent key/scale track
     # (manifest `keys:` key, spec §7.7). Permissive like the other side-files:
     # missing / unreadable / malformed -> None, never fatal. Stored as a
@@ -828,28 +1176,22 @@ def load_song(
                     }
 
     _fpv = manifest.get("feedpak_version")
-    # Optional full-mix audio — manifest `original_audio:` key. The single
-    # pre-separation mixdown that ships alongside the per-instrument stems.
-    # Same permissive, path-traversal-guarded posture as drum_tab above: a
-    # missing/escaping/absent file simply leaves the full mix unavailable (the
-    # player falls back to the separate stems) rather than aborting the load.
-    # We store the manifest-relative string so server.py can build its URL the
-    # same way it builds stem URLs (via the /api/sloppak/.../file/ endpoint).
-    original_audio_data: str | None = None
-    original_audio_rel = manifest.get("original_audio")
-    if isinstance(original_audio_rel, str) and original_audio_rel.strip():
-        rel = original_audio_rel.strip()
-        try:
-            oa_path = (source_dir / rel).resolve()
-            oa_path.relative_to(source_dir.resolve())
-        except ValueError:
-            log.warning("sloppak: original_audio path %r escapes source_dir — skipped", rel)
-            oa_path = None
-        except OSError as e:
-            log.warning("sloppak: original_audio path resolution failed (%s) — skipped", e)
-            oa_path = None
-        if oa_path is not None and oa_path.is_file():
-            original_audio_data = rel
+    # The pack's full mix. Normally the RESERVED `full` stem partitioned out
+    # above (spec §5.3) — no path work needed, it was validated with the other
+    # stems and its URL is built the same way. Only when the pack has no `full`
+    # stem do we fall back to the DEPRECATED `original_audio:` key, which is the
+    # shape every pack written before feedpak 1.15.0 uses.
+    if full_mix_stem is not None:
+        full_mix_data: str | None = full_mix_stem["file"]
+    elif find_full_mix(stems) is not None:
+        # Single-mix pack: its ONE stem is the mixdown, so there is no mixdown to
+        # offer *apart from* the stems. Never fall through to the legacy key here
+        # — a pack that both carries a `full` stem and names the old key would
+        # otherwise surface the mixdown twice (once as the stem the player is
+        # already playing, once as a "pristine" track to cross to).
+        full_mix_data = None
+    else:
+        full_mix_data = _legacy_full_mix(manifest, source_dir)
 
     return LoadedSloppak(
         song=song,
@@ -864,7 +1206,7 @@ def load_song(
         keys=keys_data,
         notation_by_id=notation_by_id_data,
         arrangement_ids=arrangement_ids_acc,
-        original_audio=original_audio_data,
+        full_mix=full_mix_data,
     )
 
 
@@ -909,7 +1251,7 @@ def extract_meta(path: Path) -> dict:
     tuning_offsets = _tuning_for_meta(arr_list)
 
     stems_list = manifest.get("stems", []) or []
-    stem_ids: list[str] = []
+    valid_stems: list[dict] = []
     for s in stems_list:
         if not isinstance(s, dict):
             continue
@@ -923,7 +1265,13 @@ def extract_meta(path: Path) -> dict:
             isinstance(sid, str) and sid
             and isinstance(sfile, str) and sfile
         ):
-            stem_ids.append(sid)
+            valid_stems.append({"id": sid, "file": sfile})
+    # Partition exactly as load_song() does, for the same reason the library
+    # filter must not lie: `full` is the mixdown, not an instrument (spec §5.3).
+    # A separated pack that retains it would otherwise offer the user a "full"
+    # stem chip alongside guitar/bass/drums and count it as a seventh stem.
+    _full, instrument_stems = partition_stems(valid_stems)
+    stem_ids = [s["id"] for s in instrument_stems]
     stem_count = len(stem_ids)
 
     return {

lib/tunings.py

@@ -101,14 +101,16 @@ def open_midis_to_freqs(midis: list[int], reference_pitch: float = DEFAULT_REFER
 def freqs_to_midis(freqs: list[float], reference_pitch: float = DEFAULT_REFERENCE_PITCH) -> list[int] | None:
     """Return absolute open-string MIDI notes for frequencies at the supplied
     A4 reference — the inverse of open_midis_to_freqs. None if any entry is
-    non-numeric or non-positive (a provider could hand us anything)."""
+    non-numeric, non-finite, or non-positive (a provider could hand us
+    anything; NaN/Infinity would otherwise raise inside int(round(...)) and
+    500 the /api/tunings endpoint)."""
     out: list[int] = []
     for f in freqs:
         try:
             f = float(f)
         except (TypeError, ValueError):
             return None
-        if f <= 0:
+        if not math.isfinite(f) or f <= 0:
             return None
         out.append(int(round(69 + 12 * math.log2(f / reference_pitch))))
     return out

plugins/career/assets/career.css

@@ -99,7 +99,8 @@
 .pp-inst-plus { color: #6b7280; }
 
 /* Leather covers — per-instrument hue, embossed with layered shadows and a
-   subtle grain gradient (no image assets). */
+   subtle grain gradient (no image assets). Keep the hex pairs in sync with
+   PP_LEATHER_HEX in screen.js (the canvas card draws the same leather). */
 .pp-leather-guitar { background: linear-gradient(160deg, #5c2321, #401412); }
 .pp-leather-bass { background: linear-gradient(160deg, #1f3252, #131f36); }
 .pp-leather-keys { background: linear-gradient(160deg, #1e4034, #122a21); }
@@ -124,7 +125,7 @@
     text-align: center;
 }
 .pp-cover { transition: transform 0.15s ease, box-shadow 0.15s ease; }
-.pp-cover:hover { transform: translateY(-4px) !important; box-shadow: 0 10px 22px rgba(0, 0, 0, 0.55); }
+.pp-cover:not(.pp-tilt):hover { transform: translateY(-4px) !important; box-shadow: 0 10px 22px rgba(0, 0, 0, 0.55); }
 .pp-cover-title {
     font-weight: 700;
     font-size: 0.85rem;
@@ -257,6 +258,7 @@
 /* The rubber stamp */
 .pp-stamp {
     --pp-rot: 0deg;
+
     position: relative;
     display: flex;
     flex-direction: column;
@@ -408,3 +410,382 @@
     .pp-slam, .pp-stamp-page::after { opacity: 1; }
     .pp-stamp-hidden { opacity: 0.92; }
 }
+
+/* Badge ceremony (body-level overlay — shows over the player) */
+.pp-ceremony-overlay {
+    position: fixed;
+    inset: 0;
+    z-index: 220;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    background: rgba(3, 7, 18, 0.55);
+    backdrop-filter: blur(1.5px);
+    animation: pp-ceremony-in 0.3s ease-out;
+    cursor: pointer;
+}
+.pp-ceremony-out { opacity: 0; transition: opacity 0.3s ease-out; }
+.pp-confetti { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
+.pp-ceremony-card {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 0.5rem;
+    text-align: center;
+}
+.pp-ceremony-stamp {
+    position: relative;
+    overflow: hidden;
+    background: rgba(239, 230, 208, 0.97);
+    transform: rotate(var(--pp-rot)) scale(1.25);
+    animation: pp-slam 0.55s cubic-bezier(0.2, 0.8, 0.3, 1) 0.15s backwards;
+    margin-top: 0;
+}
+.pp-ceremony-stamp::before {
+    content: '';
+    position: absolute;
+    inset: -40%;
+    background: linear-gradient(115deg, transparent 42%, rgba(255, 255, 255, 0.55) 50%, transparent 58%);
+    transform: translateX(-120%);
+    animation: pp-shine 1.1s ease-out 0.75s forwards;
+    pointer-events: none;
+}
+@keyframes pp-shine {
+    to { transform: translateX(120%); }
+}
+@keyframes pp-ceremony-in {
+    from { opacity: 0; }
+    to { opacity: 1; }
+}
+.pp-ceremony-title {
+    margin-top: 1rem;
+    font-size: 1.15rem;
+    font-weight: 700;
+    letter-spacing: 0.18em;
+    text-transform: uppercase;
+    color: #f0e2c3;
+    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.8);
+}
+.pp-ceremony-sub { font-size: 0.8rem; color: #d1d5db; text-shadow: 0 1px 4px rgba(0, 0, 0, 0.8); }
+
+/* Hours odometer (Stage 5 post-cap — a true fact, never a meter) */
+.pp-hours {
+    font-size: 0.72rem;
+    letter-spacing: 0.08em;
+    color: #8a7a5e;
+    margin-top: 0.75rem;
+    font-variant-numeric: tabular-nums;
+}
+
+/* ── Visuals pack: trading-card tilt, emerging ink, gold foil ──────────── */
+
+/* Trading-card tilt (earned artifacts; JS feeds --pp-tilt-* on hover-capable
+   pointers only). */
+.pp-tilt {
+    position: relative;
+    overflow: hidden;
+    will-change: transform;
+}
+.pp-cover.pp-tilt {
+    transform: perspective(700px)
+        rotateX(var(--pp-tilt-x, 0deg)) rotateY(var(--pp-tilt-y, 0deg))
+        rotate(var(--pp-cover-rot, 0deg));
+    transition: transform 0.12s ease, box-shadow 0.15s ease;
+}
+.pp-cover.pp-tilt:hover { box-shadow: 0 12px 26px rgba(0, 0, 0, 0.6); }
+.pp-stamp-page.pp-tilt {
+    overflow: visible;
+    transform: perspective(600px)
+        rotateX(var(--pp-tilt-x, 0deg)) rotateY(var(--pp-tilt-y, 0deg))
+        rotate(var(--pp-rot));
+    transition: transform 0.12s ease;
+}
+.pp-tilt::after {
+    content: '';
+    position: absolute;
+    inset: 0;
+    border-radius: inherit;
+    background: linear-gradient(105deg,
+        transparent calc(var(--pp-glint-x, 50%) - 14%),
+        rgba(255, 255, 255, 0.16) var(--pp-glint-x, 50%),
+        transparent calc(var(--pp-glint-x, 50%) + 14%));
+    opacity: 0;
+    transition: opacity 0.2s ease;
+    pointer-events: none;
+}
+.pp-tilt:hover::after { opacity: 1; }
+
+/* Emerging-stamp ink: the ghost fills as qualifying songs land. */
+.pp-stamp-ghost::before {
+    content: '';
+    position: absolute;
+    inset: 7%;
+    border-radius: 999px;
+    background: conic-gradient(rgba(154, 91, 22, 0.16) var(--pp-fill, 0%), transparent 0);
+    pointer-events: none;
+}
+
+/* Gold ink — a REAL gold badge (comb-verified improv). */
+.pp-stamp-gold {
+    border-color: #b8860b;
+    color: #a97b1b;
+    box-shadow: inset 0 0 0 3px #f3e8c8, inset 0 0 0 4px #b8860b;
+}
+.pp-stamp-mini.pp-stamp-gold {
+    color: #f0c75e;
+    border-color: #f0c75e;
+    box-shadow: none;
+}
+/* Gold foil chip — rendered only alongside an earned gold stamp. */
+.pp-gold-foil {
+    position: relative;
+    overflow: hidden;
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    margin-top: 0.9rem;
+    padding: 0.28rem 0.85rem;
+    border-radius: 999px;
+    border: 2px solid #d9a253;
+    color: #c89040;
+    font-size: 0.58rem;
+    font-weight: 700;
+    letter-spacing: 0.32em;
+}
+.pp-gold-foil::after {
+    content: '';
+    position: absolute;
+    inset: 0;
+    background: linear-gradient(100deg, transparent 40%, rgba(255, 223, 128, 0.35) 50%, transparent 60%);
+    transform: translateX(-120%);
+    animation: pp-foil 3.4s ease-in-out infinite;
+}
+@keyframes pp-foil {
+    0%, 55% { transform: translateX(-120%); }
+    100% { transform: translateX(120%); }
+}
+
+@media (prefers-reduced-motion: reduce) {
+    .pp-gold-foil::after { animation: none; }
+    .pp-cover.pp-tilt, .pp-stamp-page.pp-tilt { transition: none; }
+    /* The hover glint is motion theatrics too — not just the JS tilt. */
+    .pp-tilt::after { display: none; }
+}
+
+/* Practice invitations — closest stamps + bring-these-up */
+.pp-closest {
+    border: 1px solid rgba(75, 85, 99, 0.45);
+    border-radius: 0.6rem;
+    background: linear-gradient(165deg, rgba(45, 55, 72, 0.4), rgba(31, 41, 55, 0.4));
+    padding: 0.6rem 0.75rem;
+    display: flex;
+    flex-direction: column;
+    gap: 0.3rem;
+}
+.pp-closest-head {
+    font-size: 0.62rem;
+    letter-spacing: 0.22em;
+    text-transform: uppercase;
+    color: #9ca3af;
+}
+.pp-closest-row {
+    display: flex;
+    align-items: baseline;
+    gap: 0.75rem;
+    text-align: left;
+    font-size: 0.8rem;
+    padding: 0.15rem 0.25rem;
+    border-radius: 0.35rem;
+}
+.pp-closest-row:hover { background: rgba(55, 65, 81, 0.5); }
+.pp-closest-genre { color: #e5e7eb; font-weight: 600; white-space: nowrap; }
+.pp-closest-ask { color: #9ca3af; font-size: 0.72rem; }
+.pp-closest-ask em { color: #cbd5e1; font-style: italic; }
+
+.pp-nearest { margin-top: 0.6rem; border-top: 1px dashed rgba(138, 122, 94, 0.4); padding-top: 0.5rem; }
+.pp-nearest-head {
+    font-size: 0.58rem;
+    letter-spacing: 0.22em;
+    text-transform: uppercase;
+    color: #8a7a5e;
+    margin-bottom: 0.25rem;
+}
+.pp-nearest-row { font-size: 0.7rem; color: #6d5d40; padding: 0.1rem 0; }
+.pp-nearest-row em { color: #3f3428; }
+/* ── Career surfaces outside the plugin: profile wall + home card ───────── */
+
+.pp-wall { display: flex; flex-direction: column; gap: 0.6rem; }
+.pp-wall-head {
+    display: flex;
+    align-items: baseline;
+    justify-content: space-between;
+    font-weight: 600;
+    color: #e5e7eb;
+    font-size: 0.9rem;
+}
+.pp-wall-meta { color: #9ca3af; font-size: 0.7rem; font-weight: 400; }
+.pp-wall-shelf {
+    display: flex;
+    align-items: center;
+    flex-wrap: wrap;
+    gap: 0.5rem;
+    padding: 0.35rem 0;
+    border-bottom: 1px solid rgba(75, 85, 99, 0.25);
+}
+.pp-wall-inst {
+    font-size: 0.62rem;
+    letter-spacing: 0.18em;
+    text-transform: uppercase;
+    color: #6b7280;
+    min-width: 3.6rem;
+}
+.pp-wall-cover {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 0.1rem;
+    width: 4.2rem;
+    height: 5.6rem;
+    border-radius: 0.3rem 0.45rem 0.45rem 0.3rem;
+    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.07),
+        inset 0.25rem 0 0.4rem -0.25rem rgba(0, 0, 0, 0.8),
+        0 3px 8px rgba(0, 0, 0, 0.4);
+    padding: 0.3rem;
+    transition: transform 0.15s ease;
+}
+.pp-wall-cover:hover { transform: translateY(-3px); }
+.pp-wall-cover span {
+    font-size: 0.5rem;
+    font-weight: 700;
+    letter-spacing: 0.1em;
+    color: rgba(240, 226, 195, 0.9);
+    overflow-wrap: anywhere;
+    text-align: center;
+}
+.pp-wall-cover em {
+    font-size: 0.42rem;
+    letter-spacing: 0.22em;
+    font-style: normal;
+    color: #d9a253;
+}
+.pp-wall-none { font-size: 0.7rem; color: #6b7280; font-style: italic; }
+.pp-wall-link {
+    align-self: flex-end;
+    font-size: 0.72rem;
+    color: #22d3ee;
+    padding: 0.15rem 0.3rem;
+}
+.pp-wall-link:hover { text-decoration: underline; }
+
+/* The home-page career card — a trading card among stat tiles. */
+.pp-dash-card {
+    position: relative;
+    overflow: hidden;
+    width: 100%;
+    height: 100%;
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    gap: 0.2rem;
+    text-align: left;
+    padding: 1rem;
+    border-radius: 0.5rem;
+    border: 1px solid rgba(217, 162, 83, 0.35);
+    background:
+        linear-gradient(135deg, rgba(92, 35, 33, 0.85), rgba(30, 27, 34, 0.92)),
+        linear-gradient(160deg, #2b1414, #17111c);
+    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05), 0 4px 14px rgba(0, 0, 0, 0.35);
+    transition: transform 0.15s ease, box-shadow 0.15s ease;
+}
+.pp-dash-card:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5); }
+.pp-dash-shine {
+    position: absolute;
+    inset: 0;
+    background: linear-gradient(105deg, transparent 42%, rgba(255, 223, 128, 0.18) 50%, transparent 58%);
+    transform: translateX(-130%);
+    pointer-events: none;
+}
+.pp-dash-card:hover .pp-dash-shine { animation: pp-foil 1.4s ease-out; }
+.pp-dash-head {
+    font-size: 0.58rem;
+    letter-spacing: 0.3em;
+    text-transform: uppercase;
+    color: #d9a253;
+}
+.pp-dash-badges { color: #f3ead2; font-size: 1.05rem; }
+.pp-dash-badges b { font-weight: 700; margin: 0 0.25rem 0 0.35rem; }
+.pp-dash-meta { color: #b5a488; font-size: 0.72rem; }
+.pp-dash-ask { color: #8d9aa8; font-size: 0.66rem; }
+.pp-dash-ask em { color: #cbd5e1; }
+
+.pp-card-actions { display: flex; gap: 0.5rem; margin-top: 0.9rem; }
+
+@media (prefers-reduced-motion: reduce) {
+    .pp-dash-card:hover .pp-dash-shine { animation: none; }
+    .pp-wall-cover, .pp-dash-card { transition: none; }
+}
+
+/* ── Gigs: poster, runner strip, summary, log ───────────────────────────── */
+
+.pp-poster {
+    position: relative;
+    width: min(92vw, 420px);
+    padding: 2rem 1.6rem 1.4rem;
+    border-radius: 0.5rem;
+    background: linear-gradient(180deg, #141019, #241318);
+    border: 2px solid rgba(217, 162, 83, 0.45);
+    box-shadow: 0 10px 32px rgba(0, 0, 0, 0.6);
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 0.35rem;
+    text-align: center;
+}
+.pp-poster-venue { color: rgba(240, 226, 195, 0.7); font-size: 0.95rem; letter-spacing: 0.08em; }
+.pp-poster-presents { color: rgba(240, 226, 195, 0.4); font-size: 0.58rem; letter-spacing: 0.4em; text-transform: uppercase; }
+.pp-poster-title {
+    color: #d9a253;
+    font-size: 1.7rem;
+    font-weight: 800;
+    letter-spacing: 0.1em;
+    line-height: 1.15;
+    overflow-wrap: anywhere;
+}
+.pp-poster-inst { color: rgba(240, 226, 195, 0.5); font-size: 0.68rem; letter-spacing: 0.2em; text-transform: uppercase; }
+.pp-poster-bill { margin: 0.9rem 0 0.5rem; display: flex; flex-direction: column; gap: 0.35rem; width: 100%; }
+.pp-poster-line { color: rgba(240, 226, 195, 0.85); font-size: 0.85rem; }
+.pp-poster-line span { color: rgba(217, 162, 83, 0.7); margin-right: 0.35rem; }
+.pp-poster-line em { color: rgba(240, 226, 195, 0.5); font-style: italic; font-size: 0.72rem; }
+.pp-poster-line b { color: #f3d179; margin-left: 0.3rem; }
+.pp-poster-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; margin-top: 0.6rem; }
+.pp-poster-summary { cursor: default; }
+
+.pp-gig-strip {
+    position: fixed;
+    top: 0.5rem;
+    left: 50%;
+    transform: translateX(-50%);
+    z-index: 35; /* above the rail (30), under popovers (40) — the chrome invariant */
+    background: rgba(10, 8, 14, 0.85);
+    border: 1px solid rgba(217, 162, 83, 0.4);
+    border-radius: 999px;
+    color: rgba(240, 226, 195, 0.85);
+    font-size: 0.72rem;
+    padding: 0.3rem 0.9rem;
+    pointer-events: none;
+    backdrop-filter: blur(2px);
+}
+.pp-gig-strip b { color: #d9a253; letter-spacing: 0.2em; }
+.pp-gig-strip em { color: #f3ead2; font-style: italic; }
+
+.pp-giglog { margin-top: 0.6rem; border-top: 1px dashed rgba(138, 122, 94, 0.4); padding-top: 0.5rem; }
+.pp-giglog-head {
+    font-size: 0.58rem;
+    letter-spacing: 0.22em;
+    text-transform: uppercase;
+    color: #8a7a5e;
+    margin-bottom: 0.25rem;
+}
+.pp-giglog-row { font-size: 0.7rem; color: #6d5d40; padding: 0.1rem 0; }
+.pp-giglog-row b { color: #9a5b16; letter-spacing: 0.06em; }

plugins/career/passports.json

@@ -3,7 +3,33 @@
         "songs": 5,
         "min_stars": 2
     },
-    "genres": {},
+    "gig": {
+        "min_songs": 3,
+        "max_songs": 5,
+        "stakes_songs": 2,
+        "encore_accuracy": 0.75
+    },
+    "families": [
+        { "key": "metal", "match": ["metal", "djent", "grindcore", "thrash", "doom"] },
+        { "key": "blues", "match": ["blues"] },
+        { "key": "jazz", "match": ["jazz", "bebop", "swing", "bossa"] },
+        { "key": "funk", "match": ["funk", "disco"] },
+        { "key": "rock", "match": ["rock", "punk", "grunge", "shoegaze"] }
+    ],
+    "genres": {
+        "blues": { "virtuoso_nodes": { "guitar": ["blues_shuffle"] } },
+        "rock": { "virtuoso_nodes": { "guitar": ["rock_power_backbeat"] } },
+        "metal": { "virtuoso_nodes": { "guitar": ["melodic_metal_gallop"] } },
+        "funk": { "virtuoso_nodes": { "guitar": ["sixteenth_pocket"] } },
+        "jazz": { "virtuoso_nodes": { "guitar": ["vl_shells"] } }
+    },
+    "drill_labels": {
+        "blues_shuffle": "Blues Shuffle",
+        "rock_power_backbeat": "Power Chords & Backbeat",
+        "melodic_metal_gallop": "Gallop Picking",
+        "sixteenth_pocket": "16th Pocket",
+        "vl_shells": "Shell Voicings"
+    },
     "graded_instruments": [
         "guitar",
         "keys"

plugins/career/routes.py

@@ -26,11 +26,14 @@ Endpoints (all under /api/plugins/career/):
   POST   /passports/commit            commit to an instrument (the wax seal, Stage 0)
   POST   /passports/open              open a genre passport for an instrument
   POST   /drill-state                 relayed virtuoso.progress snapshot (drill intake)
+  POST   /gigs/propose                build a playable setlist for a genre gig
+  POST   /gigs                        log a COMPLETED gig (abandoned sets never log)
 """
 
 import hashlib
 import json
 import logging
+import random
 import re
 import shutil
 import tempfile
@@ -114,10 +117,9 @@ def _stars():
     detail = []
     for filename, acc, title, artist in rows:
         acc = acc or 0.0
-        stars = sum(1 for t in thresholds if acc >= t)
+        stars, next_at = _star_progress(acc, thresholds)
         if stars:
             per_song[filename] = stars
-        next_at = next((t for t in thresholds if acc < t), None)
         detail.append({
             "filename": filename,
             "title": title or filename,
@@ -203,21 +205,24 @@ def _instrument_of(arrangements, arrangement):
 
 
 def _played_by_instrument_genre():
-    """(instrument, genre_key) → {filename: stub dict}. Best accuracy per
-    (instrument, song); the JOIN keeps the same dead-song filter as _stars()."""
+    """((instrument, genre_key) → {filename: stub dict},
+        (instrument, genre_key) → total played seconds).
+    Best accuracy per (instrument, song); seconds sum across every
+    arrangement row; the JOIN keeps the same dead-song filter as _stars()."""
     db = _state["meta_db"]
     if db is None:
-        return {}
+        return {}, {}
     thresholds = _state["content"]["star_accuracy_thresholds"]
     rows = db.conn.execute(
         "SELECT s.filename, s.arrangement, s.best_accuracy, s.last_played_at, "
-        "       songs.title, songs.artist, songs.arrangements, "
+        "       s.seconds_total, songs.title, songs.artist, songs.arrangements, "
         f"      {_genre_expr(db)} "
         "FROM song_stats s JOIN songs ON songs.filename = s.filename"
     ).fetchall()
     arrs_cache = {}
     out = {}
-    for filename, arrangement, acc, played_at, title, artist, arrs_json, genre in rows:
+    seconds = {}
+    for filename, arrangement, acc, played_at, secs, title, artist, arrs_json, genre in rows:
         gkey = _genre_key(genre)
         if not gkey:
             continue
@@ -227,10 +232,12 @@ def _played_by_instrument_genre():
             except (TypeError, ValueError):
                 arrs_cache[filename] = None
         instrument = _instrument_of(arrs_cache[filename], arrangement)
+        key = (instrument, gkey)
+        seconds[key] = seconds.get(key, 0.0) + (secs or 0.0)
         acc = acc or 0.0
-        stub = out.setdefault((instrument, gkey), {}).get(filename)
+        stub = out.setdefault(key, {}).get(filename)
         if stub is None:
-            out[(instrument, gkey)][filename] = {
+            out[key][filename] = {
                 "filename": filename,
                 "title": title or filename,
                 "artist": artist or "",
@@ -244,8 +251,16 @@ def _played_by_instrument_genre():
         for stub in stubs.values():
             acc = stub["best_accuracy"]
             stub["best_accuracy"] = round(acc, 4)
-            stub["stars"] = sum(1 for t in thresholds if acc >= t)
-    return out
+            stub["stars"], stub["next_star_at"] = _star_progress(acc, thresholds)
+    return out, seconds
+
+
+def _star_progress(acc, thresholds):
+    """(stars, next_star_at) — the one place the ascending-thresholds
+    assumption lives; _stars() and the passport stubs both use it."""
+    stars = sum(1 for t in thresholds if acc >= t)
+    next_at = next((t for t in thresholds if acc < t), None)
+    return stars, next_at
 
 
 def _library_genres():
@@ -271,44 +286,120 @@ def _library_genres():
                   key=lambda r: (-r["songs_in_library"], r["genre_key"]))
 
 
-def _badge_requirement(gkey):
+def _genre_family(gkey):
+    """First family whose keyword appears in the genre key (substring — MB's
+    vocabulary is open: 'metalcore' must hit the 'metal' family without an
+    exact alias). List order decides ambiguity: families are checked top to
+    bottom, so 'blues rock' lands on whichever of blues/rock is listed first."""
+    for fam in _state["passports_content"].get("families") or []:
+        if not isinstance(fam, dict):
+            continue
+        for kw in fam.get("match") or []:
+            if isinstance(kw, str) and kw and kw in gkey:
+                return fam.get("key")
+    return None
+
+
+def _badge_requirement(gkey, instrument="guitar"):
     cfg = _state["passports_content"]
     req = dict(cfg.get("badge_requirement") or {})
     req.setdefault("songs", 5)
     req.setdefault("min_stars", 2)
-    override = (cfg.get("genres") or {}).get(gkey)
+    # Exact per-genre override wins; otherwise the genre inherits its FAMILY's
+    # requirement — so 'death metal' / 'metalcore' passports carry the metal
+    # drill without curating every MB sub-genre by hand.
+    genres_cfg = cfg.get("genres") or {}
+    override = genres_cfg.get(gkey)
+    if not isinstance(override, dict):
+        family = _genre_family(gkey)
+        override = genres_cfg.get(family) if family else None
     if isinstance(override, dict):
         req.update(override)
-    req["virtuoso_nodes"] = [n for n in (req.get("virtuoso_nodes") or [])
-                             if isinstance(n, str)]
+    # virtuoso_nodes: {instrument: [node_ids]} — a passport only carries its
+    # own instrument's drills. A flat list keeps meaning guitar (back-compat;
+    # virtuoso's drill content is guitar-first).
+    nodes = req.get("virtuoso_nodes") or []
+    if isinstance(nodes, dict):
+        nodes = nodes.get(instrument) or []
+    elif instrument != "guitar":
+        nodes = []
+    req["virtuoso_nodes"] = [n for n in nodes if isinstance(n, str)]
     return req
 
 
 def _drill_by_node():
     doc = _load_json(_drill_file(), {})
     if not isinstance(doc, dict):
-        return None, {}
+        return None, {}, {}
     snapshot = doc.get("snapshot") if isinstance(doc.get("snapshot"), dict) else {}
     by_node = snapshot.get("byNode") if isinstance(snapshot.get("byNode"), dict) else {}
-    return doc.get("received_at"), by_node
+    gold = snapshot.get("goldImprov") if isinstance(snapshot.get("goldImprov"), dict) else {}
+    return doc.get("received_at"), by_node, gold
+
+
+def _merge_drill_nodes(old, new):
+    """Gained-only merge of virtuoso byNode snapshots: a completion artifact
+    once relayed never un-earns via a stale snapshot (multi-browser races,
+    settings import, the once-per-session boot relay). Incoming wins the
+    descriptive fields; masteredAt / depth flips / keysCleared only grow."""
+    out = dict(old)
+    for node_id, incoming in new.items():
+        if not isinstance(incoming, dict):
+            continue
+        cur = out.get(node_id)
+        if not isinstance(cur, dict):
+            out[node_id] = incoming
+            continue
+        merged = dict(cur)
+        merged.update(incoming)
+        merged["masteredAt"] = cur.get("masteredAt") or incoming.get("masteredAt")
+        d_old = cur.get("depth") if isinstance(cur.get("depth"), dict) else {}
+        d_new = incoming.get("depth") if isinstance(incoming.get("depth"), dict) else {}
+        depth = dict(d_new)
+        for axis, val in d_old.items():
+            if val and not depth.get(axis):
+                depth[axis] = val
+        if depth:
+            merged["depth"] = depth
+        keys_old = cur.get("keysCleared") if isinstance(cur.get("keysCleared"), list) else []
+        keys_new = incoming.get("keysCleared") if isinstance(incoming.get("keysCleared"), list) else []
+        merged["keysCleared"] = keys_old + [k for k in keys_new if k not in keys_old]
+        out[node_id] = merged
+    return out
+
+
+def _merge_gold(old, new):
+    """Gained-only merge of goldImprov artifacts: a minted style never
+    un-mints via a stale relay; the FIRST artifact per style is kept."""
+    out = dict(old)
+    for style_id, art in (new or {}).items():
+        if isinstance(art, dict) and style_id not in out:
+            out[style_id] = art
+    return out
 
 
 def _node_cleared(by_node, node_id):
-    """A drill counts as cleared on real completion evidence: mastered, or any
-    depth rung flipped true (virtuoso's gained-only false→true artifacts)."""
+    """A drill counts as cleared on real completion evidence: mastered, any
+    depth rung flipped true, or a key cleared (a top-tier clean pass in one
+    key — virtuoso's first gained-only artifact, and an achievable Bronze
+    bar; the depth rungs additionally require a maxed speed tier)."""
     entry = by_node.get(node_id)
     if not isinstance(entry, dict):
         return False
     depth = entry.get("depth") if isinstance(entry.get("depth"), dict) else {}
-    return bool(entry.get("masteredAt")) or any(bool(v) for v in depth.values())
+    keys = entry.get("keysCleared")
+    return (bool(entry.get("masteredAt"))
+            or any(bool(v) for v in depth.values())
+            or bool(isinstance(keys, list) and keys))
 
 
 def _passports_view():
     cfg = _state["passports_content"]
     graded = set(cfg.get("graded_instruments") or [])
     st = _career_state()
-    played = _played_by_instrument_genre()
-    received_at, by_node = _drill_by_node()
+    all_gigs = st.get("gigs") if isinstance(st.get("gigs"), list) else []
+    played, played_seconds = _played_by_instrument_genre()
+    received_at, by_node, gold_improv = _drill_by_node()
     instruments = {}
     for inst in cfg.get("instruments") or []:
         committed_at = (st["instruments"].get(inst) or {}).get("committed_at")
@@ -318,7 +409,7 @@ def _passports_view():
         for gkey, meta in sorted(opened.items(),
                                  key=lambda kv: ((kv[1] or {}).get("opened_at") or "", kv[0])):
             meta = meta if isinstance(meta, dict) else {}
-            req = _badge_requirement(gkey)
+            req = _badge_requirement(gkey, inst)
             songs = list(played.get((inst, gkey), {}).values())
             for s in songs:
                 s["qualifies"] = s["stars"] >= req["min_stars"]
@@ -334,9 +425,33 @@ def _passports_view():
                 # false badge denial — the doc's shown-not-judged rule.
                 badge = "shown_not_judged"
             elif qualifying >= req["songs"] and len(cleared) == len(required):
-                badge = "earned"
+                # Bronze is earned; GOLD upgrades it when a verified improv
+                # artifact exists for this genre's jam style. Virtuoso mints
+                # under raw STYLE_PALETTES ids ('punk', 'djent', 'disco', ...),
+                # which are mostly NOT family keys — so match in family space:
+                # the same keyword bucketing genres get ('punk' and 'punk
+                # rock' both bucket to 'rock'), with the exact key as a direct
+                # hit. Bronze remains a standalone win; gold never becomes an
+                # obligation.
+                fam = _genre_family(gkey)
+                gold = any(
+                    s == gkey or (fam is not None and _genre_family(s) == fam)
+                    for s in gold_improv
+                )
+                badge = "gold" if gold else "earned"
             else:
                 badge = "in_progress"
+            # Practice invitation: the non-qualifying songs closest to the
+            # QUALIFYING bar (the badge ask), nearest first — invitation
+            # data, the UI voices it without meters.
+            thresholds = _state["content"]["star_accuracy_thresholds"]
+            bar = (thresholds[req["min_stars"] - 1]
+                   if 0 < req["min_stars"] <= len(thresholds) else None)
+            nearest = [] if bar is None else sorted(
+                (s for s in songs if not s["qualifies"]),
+                key=lambda s: bar - s["best_accuracy"])[:3]
+            for s in nearest:
+                s["bar_at"] = bar
             passports.append({
                 "genre_key": gkey,
                 "genre": meta.get("genre") or gkey,
@@ -345,15 +460,25 @@ def _passports_view():
                 "graded": is_graded,
                 "songs": songs,
                 "qualifying_count": qualifying,
+                "nearest": nearest,
+                # Honest hours odometer (Stage 5 post-cap): a true fact that
+                # only grows — never a target, never a meter.
+                "seconds_total": round(played_seconds.get((inst, gkey), 0.0), 1),
                 "drills": {"required": required, "cleared": cleared},
                 "badge": badge,
             })
-        instruments[inst] = {"committed_at": committed_at, "passports": passports}
+        inst_gigs = [g for g in all_gigs if g.get("instrument") == inst]
+        for p in passports:
+            p["gigs"] = [g for g in inst_gigs if g.get("genre_key") == p["genre_key"]][-20:][::-1]
+        instruments[inst] = {"committed_at": committed_at, "passports": passports,
+                             "gig_count": len(inst_gigs)}
     return {
         "config": {
             "badge_requirement": cfg.get("badge_requirement") or {},
             "graded_instruments": sorted(graded),
             "instruments": list(cfg.get("instruments") or []),
+            # Career-side display names for virtuoso drill node ids.
+            "drill_labels": dict(cfg.get("drill_labels") or {}),
         },
         "instruments": instruments,
         "genres": _library_genres(),
@@ -361,6 +486,60 @@ def _passports_view():
     }
 
 
+def _gig_config():
+    cfg = _state["passports_content"].get("gig")
+    cfg = cfg if isinstance(cfg, dict) else {}
+
+    def _num(key, default, cast):
+        # Tuning data, not code: junk falls back instead of 500ing both gig
+        # endpoints, and a legitimate 0 (stakes_songs: 0) is respected.
+        val = cfg.get(key)
+        if isinstance(val, bool) or not isinstance(val, (int, float)):
+            return default
+        return cast(val)
+
+    return {
+        "min_songs": max(1, _num("min_songs", 3, int)),
+        "max_songs": max(1, _num("max_songs", 5, int)),
+        "stakes_songs": max(0, _num("stakes_songs", 2, int)),
+        "encore_accuracy": _num("encore_accuracy", 0.75, float),
+    }
+
+
+def _current_venue():
+    """Highest unlocked venue (the room you can book today)."""
+    stars_total, _, _ = _stars()
+    best = None
+    for v in _state["content"]["venues"]:
+        if stars_total >= v["star_threshold"]:
+            if best is None or v["star_threshold"] >= best["star_threshold"]:
+                best = v
+    return best
+
+
+def _unplayed_genre_songs(gkey, exclude, limit):
+    """Library songs of a genre with no stats yet — a young passport's gig
+    still gets a full set (playing them is how stubs start).
+    ponytail: full stat-less scan + python-side genre match (a few ms at 7k
+    songs, single-user); push the match into SQL if propose ever feels slow."""
+    db = _state["meta_db"]
+    if db is None:
+        return []
+    rows = db.conn.execute(
+        f"SELECT filename, title, artist, {_genre_expr(db)} AS g FROM songs "
+        "WHERE filename NOT IN (SELECT filename FROM song_stats)"
+    ).fetchall()
+    out = []
+    for filename, title, artist, genre in rows:
+        if _genre_key(genre) != gkey or filename in exclude:
+            continue
+        out.append({"filename": filename, "title": title or filename,
+                    "artist": artist or ""})
+        if len(out) >= limit:
+            break
+    return out
+
+
 def _validate_pack_dir(pack_dir: Path):
     """Raise ValueError unless pack_dir holds a complete venue pack."""
     manifest_path = pack_dir / "manifest.json"
@@ -528,15 +707,154 @@ def setup(app, context):
         # Only the fields the badge check reads are kept.
         if not isinstance(body, dict) or not isinstance(body.get("byNode"), dict):
             raise HTTPException(400, "Expected a progress snapshot with byNode.")
-        snapshot = {"mode": body.get("mode"), "xp": body.get("xp"),
-                    "byNode": body["byNode"]}
-        if len(json.dumps(snapshot)) > DRILL_SNAPSHOT_MAX_BYTES:
+        # Bound the INCOMING snapshot before the merge — the gained-only merge
+        # drops junk entries, which must not become a size-guard bypass.
+        if len(json.dumps(body["byNode"])) > DRILL_SNAPSHOT_MAX_BYTES:
+            raise HTTPException(413, "Snapshot too large.")
+        gold_in = body.get("goldImprov", {})
+        if not isinstance(gold_in, dict):
+            # A relay bug must be LOUD, not a silent 200 that drops gold.
+            raise HTTPException(400, "goldImprov must be an object keyed by style id.")
+        # Keep only plausible artifacts: a dict that names its verifier —
+        # an empty {} must not mint an evidence-free gold.
+        gold_in = {k: v for k, v in gold_in.items()
+                   if isinstance(v, dict) and v.get("verifier")}
+        # Same pre-merge bound byNode gets: the gained-only merge dropping
+        # junk must not become a size-guard bypass (nor lock-held CPU burn).
+        if len(json.dumps(gold_in)) > DRILL_SNAPSHOT_MAX_BYTES:
             raise HTTPException(413, "Snapshot too large.")
         with _lock:
+            _, existing, existing_gold = _drill_by_node()
+            snapshot = {"mode": body.get("mode"), "xp": body.get("xp"),
+                        "byNode": _merge_drill_nodes(existing, body["byNode"]),
+                        "goldImprov": _merge_gold(existing_gold, gold_in)}
+            if len(json.dumps(snapshot)) > DRILL_SNAPSHOT_MAX_BYTES:
+                raise HTTPException(413, "Snapshot too large.")
             _save_json(_drill_file(), {"received_at": _now_iso(),
                                        "snapshot": snapshot})
         return {"ok": True}
 
+    @app.post(f"/api/plugins/{PLUGIN_ID}/gigs/propose")
+    def propose_gig(body: dict = Body(...)):
+        inst = str((body or {}).get("instrument") or "")
+        genre = _genre_display((body or {}).get("genre"))
+        gkey = genre.lower()
+        if inst not in (_state["passports_content"].get("instruments") or []):
+            raise HTTPException(400, "Unknown instrument.")
+        if not gkey or len(genre) > GENRE_MAX_LEN:
+            raise HTTPException(400, "Provide a genre.")
+        cfg = _gig_config()
+        try:
+            size = int((body or {}).get("size") or 4)
+        except (TypeError, ValueError):
+            raise HTTPException(400, "size must be a number.")
+        size = max(cfg["min_songs"], min(cfg["max_songs"], size))
+        played, _seconds = _played_by_instrument_genre()
+        stubs = list(played.get((inst, gkey), {}).values())
+        req = _badge_requirement(gkey, inst)
+        qualifying = [s for s in stubs if s["stars"] >= req["min_stars"]]
+        rest = [s for s in stubs if s["stars"] < req["min_stars"]]
+        # The set: mostly songs you own, plus a couple of stakes songs near
+        # the bar; a young passport fills from unplayed genre songs so the
+        # first gig is how stubs start. random per call = free re-roll.
+        random.shuffle(qualifying)
+        rest.sort(key=lambda s: -s["best_accuracy"])
+        qtaken = max(1, size - cfg["stakes_songs"])
+        picks = qualifying[:qtaken]
+        for s in rest:
+            if len(picks) >= size:
+                break
+            picks.append(s)
+        # Surplus qualifying songs backfill a short set — a mature passport
+        # with no near-bar songs left must still fill the bill. Offset by how
+        # many QUALIFYING songs were taken, not len(picks): rest's stakes
+        # additions would otherwise skip eligible qualifying songs entirely.
+        for s in qualifying[qtaken:]:
+            if len(picks) >= size:
+                break
+            picks.append(s)
+        if len(picks) < size:
+            exclude = {s["filename"] for s in picks}
+            picks.extend(_unplayed_genre_songs(gkey, exclude, size - len(picks)))
+        if not picks:
+            raise HTTPException(404, "No songs of this genre in the library.")
+        venue = _current_venue()
+        return {
+            "instrument": inst,
+            "genre": genre,
+            "genre_key": gkey,
+            "venue_id": venue["id"] if venue else None,
+            "venue_name": venue["name"] if venue else "",
+            "songs": [{"filename": s["filename"], "title": s.get("title") or s["filename"],
+                       "artist": s.get("artist") or ""} for s in picks[:size]],
+        }
+
+    @app.post(f"/api/plugins/{PLUGIN_ID}/gigs")
+    def log_gig(body: dict = Body(...)):
+        # Called by the runner ONLY when the set completed — an abandoned set
+        # never logs (no fail state; the gig you finished is the gig you
+        # played). Accuracies come from song_stats, freshly written by the
+        # set's own plays.
+        inst = str((body or {}).get("instrument") or "")
+        genre = _genre_display((body or {}).get("genre"))
+        gkey = genre.lower()
+        venue_id = str((body or {}).get("venue_id") or "")
+        songs = (body or {}).get("songs")
+        if inst not in (_state["passports_content"].get("instruments") or []):
+            raise HTTPException(400, "Unknown instrument.")
+        if not gkey or len(genre) > GENRE_MAX_LEN:
+            raise HTTPException(400, "Provide a genre.")
+        if venue_id and (not VENUE_ID_RE.fullmatch(venue_id) or _venue(venue_id) is None):
+            raise HTTPException(400, "Unknown venue.")
+        if (not isinstance(songs, list) or not songs or len(songs) > 8
+                or not all(isinstance(f, str) and f.strip() for f in songs)):
+            raise HTTPException(400, "songs must be 1-8 filenames.")
+        db = _state["meta_db"]
+        entries = []
+        accuracies = []
+        for filename in songs:
+            title = filename
+            accuracy = None
+            if db is not None:
+                # The NEWEST row is the set's own just-recorded play — a
+                # MAX(last_accuracy) across arrangements would happily log a
+                # stale higher score from another instrument's old session.
+                row = db.conn.execute(
+                    "SELECT last_accuracy FROM song_stats WHERE filename = ? "
+                    "ORDER BY last_played_at DESC LIMIT 1",
+                    (filename,)).fetchone()
+                if row and row[0] is not None:
+                    accuracy = round(float(row[0]), 4)
+                    accuracies.append(accuracy)
+                trow = db.conn.execute(
+                    "SELECT title FROM songs WHERE filename = ?", (filename,)).fetchone()
+                if trow and trow[0]:
+                    title = trow[0]
+            entries.append({"filename": filename, "title": title, "accuracy": accuracy})
+        # Encore needs the WHOLE set scored at the bar — one scored song must
+        # not earn an encore for a set that was 4/5 unheard.
+        encore = (len(accuracies) == len(songs) and
+                  sum(accuracies) / len(accuracies) >= _gig_config()["encore_accuracy"])
+        gig = {
+            "at": _now_iso(),
+            "venue_id": venue_id or None,
+            "instrument": inst,
+            "genre": genre,
+            "genre_key": gkey,
+            "songs": entries,
+            "encore": encore,
+        }
+        with _lock:
+            st = _career_state()
+            if not isinstance(st.get("gigs"), list):
+                st["gigs"] = []
+            st["gigs"].append(gig)
+            # ponytail: hard cap — nothing reads past the last 20 per
+            # passport; the state file must not grow (and export) forever.
+            st["gigs"] = st["gigs"][-500:]
+            _save_json(_state_file(), st)
+        return {"ok": True, "gig": gig}
+
     @app.post(f"/api/plugins/{PLUGIN_ID}/packs/{{venue_id}}/download")
     def start_download(venue_id: str):
         venue = _venue(venue_id) if VENUE_ID_RE.fullmatch(venue_id) else None

plugins/career/screen.html

@@ -4,11 +4,11 @@
         <div id="career-stars-summary" class="text-sm text-gray-400"></div>
     </div>
     <div class="career-tabs" role="tablist">
-        <button class="career-tab" data-career-tab="venues" role="tab">Venues</button>
-        <button class="career-tab" data-career-tab="passports" role="tab">Passports</button>
+        <button class="career-tab" data-career-tab="venues" role="tab" id="career-tab-btn-venues" aria-controls="career-tab-venues">Venues</button>
+        <button class="career-tab" data-career-tab="passports" role="tab" id="career-tab-btn-passports" aria-controls="career-tab-passports">Passports</button>
     </div>
 
-    <div id="career-tab-venues">
+    <div id="career-tab-venues" role="tabpanel" aria-labelledby="career-tab-btn-venues">
         <p class="text-sm text-gray-400 mb-4">Earn stars by playing songs well — 60% accuracy is a star, 75% two, 85% three. Stars unlock bigger stages, and the crowd plays along with you.</p>
         <div id="career-progress-wrap" class="mb-6">
             <div class="career-bar-track">
@@ -26,9 +26,10 @@
         </div>
     </div>
 
-    <div id="career-tab-passports" class="hidden">
+    <div id="career-tab-passports" class="hidden" role="tabpanel" aria-labelledby="career-tab-btn-passports">
         <p class="text-sm text-gray-400 mb-4">Commit to an instrument, pick a genre, and stamp your way to its badge — five ★★ songs mint a Bronze. Your passport wall is who you are as a musician.</p>
         <div id="pp-instruments" class="pp-instruments"></div>
+        <div id="pp-closest" class="mt-4"></div>
         <div id="pp-shelf-wrap" class="mt-5">
             <div id="pp-shelf" class="pp-shelf"></div>
         </div>

plugins/career/settings.html

@@ -8,3 +8,25 @@
      Virtuoso plugin reports. These ride along in
      <em>Settings → Export</em> automatically.</p>
 </div>
+<hr class="border-gray-800 my-3">
+<div class="space-y-3 text-sm">
+    <label class="flex items-center justify-between gap-4">
+        <span>
+            <span class="text-gray-200 font-medium">Crowd sound reactions</span>
+            <span class="block text-xs text-gray-500">Cheers when the crowd's mood rises, boos when it drops. Uses each venue's own recordings.</span>
+        </span>
+        <input type="checkbox" id="career-sfx-toggle" class="accent-cyan-500 w-4 h-4">
+    </label>
+</div>
+<script>
+(function () {
+    'use strict';
+    var KEY = 'feedBack-venue-crowd-sfx';
+    var box = document.getElementById('career-sfx-toggle');
+    if (!box) return;
+    try { box.checked = localStorage.getItem(KEY) === 'on'; } catch (e) { /* ok */ }
+    box.addEventListener('change', function () {
+        try { localStorage.setItem(KEY, box.checked ? 'on' : 'off'); } catch (e) { /* ok */ }
+    });
+}());
+</script>

plugins/career/tests/passports.test.js

@@ -6,8 +6,8 @@ const fs = require('node:fs');
 const path = require('node:path');
 const vm = require('node:vm');
 
-function load() {
-    const store = {};
+function load(seed) {
+    const store = Object.assign({}, seed);
     const window = {
         console,
         localStorage: {
@@ -80,4 +80,170 @@ test('detectNewBadges notifies once per badge, never after it is seen', () => {
     t.markBadgeSeen('guitar', 'blues');
     // JSON-compare: vm objects carry a foreign Object prototype.
     assert.equal(JSON.stringify(t.seenBadges()), '{"guitar/blues":1}');
+
+    // Fresh session (new vm, empty notify cache) with the badge already seen:
+    // detection must stay silent.
+    const w2 = load({ 'feedBack-career-badges-seen': '{"guitar/blues":1}' });
+    w2.__careerPassportTest.detectNewBadges(view);
+    assert.equal(w2.notifications.length, 0);
+});
+
+test('a new badge triggers the crowd celebrate() exactly once', () => {
+    const w = load();
+    let calls = 0;
+    w.v3VenueCrowd = { celebrate: () => { calls += 1; } };
+    const view = { instruments: { guitar: { passports: [
+        { genre_key: 'blues', genre: 'Blues', badge: 'earned' }] } } };
+    w.__careerPassportTest.detectNewBadges(view);
+    assert.equal(calls, 1);
+    // Same session, same view: no re-celebration.
+    w.__careerPassportTest.detectNewBadges(view);
+    assert.equal(calls, 1);
+});
+
+test('ceremony degrades when the crowd layer is absent or throws', () => {
+    const w = load();
+    const view = { instruments: { guitar: { passports: [
+        { genre_key: 'blues', genre: 'Blues', badge: 'earned' }] } } };
+    // No v3VenueCrowd at all (already exercised elsewhere, explicit here).
+    w.__careerPassportTest.detectNewBadges(view);
+    assert.equal(w.notifications.length, 1);
+    // celebrate() throwing must not break detection.
+    const w2 = load();
+    w2.v3VenueCrowd = { celebrate: () => { throw new Error('no pack'); } };
+    w2.__careerPassportTest.detectNewBadges(view);
+    assert.equal(w2.notifications.length, 1);
+});
+
+test('seenBadges tolerates corrupt stored values', () => {
+    for (const bad of ['null', '[1,2]', '"x"', '{{{']) {
+        const w = load({ 'feedBack-career-badges-seen': bad });
+        const t = w.__careerPassportTest;
+        assert.equal(JSON.stringify(t.seenBadges()), '{}', `stored ${bad}`);
+        // And detection still works on top of the recovered empty state.
+        t.detectNewBadges({ instruments: { guitar: { passports: [
+            { genre_key: 'blues', genre: 'Blues', badge: 'earned' }] } } });
+        assert.equal(w.notifications.length, 1, `stored ${bad}`);
+    }
+});
+
+test('fmtHours: silent under a minute, minutes under an hour, tenths after', () => {
+    const { fmtHours } = load().__careerPassportTest;
+    assert.equal(fmtHours(0), '');
+    assert.equal(fmtHours(59), '');
+    assert.equal(fmtHours(60), '1 min');
+    assert.equal(fmtHours(1800), '30 min');
+    assert.equal(fmtHours(3600), '1 h');
+    assert.equal(fmtHours(51120), '14.2 h');
+    assert.equal(fmtHours(null), '');
+    assert.equal(fmtHours('junk'), '');
+});
+
+test('ppFillFraction: song progress toward the bar, in-progress only', () => {
+    const { ppFillFraction } = load().__careerPassportTest;
+    const p = (badge, q, songs) => ({ badge, qualifying_count: q, requirement: { songs } });
+    assert.equal(ppFillFraction(p('in_progress', 3, 5)), 0.6);
+    assert.equal(ppFillFraction(p('in_progress', 0, 5)), 0);
+    assert.equal(ppFillFraction(p('in_progress', 7, 5)), 1);   // clamped
+    assert.equal(ppFillFraction(p('earned', 5, 5)), 0);        // no fill once earned
+    assert.equal(ppFillFraction(p('shown_not_judged', 3, 5)), 0);
+    assert.equal(ppFillFraction(p('in_progress', 3, 0)), 0);   // no bar → no fill
+    assert.equal(ppFillFraction(null), 0);
+});
+
+test('careerTotals / wall + dash card stay absent without commitment', () => {
+    const w = load();
+    const t = w.__careerPassportTest;
+    // No _pp at all → null; committed-less view → null (absent-not-empty).
+    assert.equal(t.careerTotals(), null);
+    t.setView({ config: { instruments: ['guitar'] },
+        instruments: { guitar: { committed_at: null, passports: [] } } });
+    assert.equal(t.careerTotals(), null);
+    // Committed but zero passports opened: still absent (no zero-wall).
+    t.setView({ config: { instruments: ['guitar'] },
+        instruments: { guitar: { committed_at: 'x', passports: [] } } });
+    assert.equal(t.careerTotals(), null);
+    // Committed with an earned badge + hours → totals aggregate.
+    t.setView({ config: { instruments: ['guitar', 'bass'] },
+        instruments: {
+            guitar: { committed_at: 'x', passports: [
+                { badge: 'earned', seconds_total: 3600, genre: 'Blues', genre_key: 'blues' },
+                { badge: 'in_progress', seconds_total: 120, genre: 'Funk', genre_key: 'funk',
+                  qualifying_count: 4, requirement: { songs: 5, min_stars: 2 } }] },
+            bass: { committed_at: null, passports: [] },
+        } });
+    const totals = t.careerTotals();
+    assert.equal(totals.badges, 1);
+    assert.equal(totals.seconds, 3720);
+    assert.equal(totals.walls.length, 1);
+});
+
+test('gig runner lifecycle: advance on ended, abandon on dead-queue stop', () => {
+    const w = load();
+    const t = w.__careerPassportTest;
+    let remaining = 1;
+    w.feedBack = { playQueue: { remaining: () => remaining, active: () => remaining > 0 } };
+    t.setGigRun({
+        songs: [{ filename: 'a', title: 'A' }, { filename: 'b', title: 'B' }],
+        venue_id: null, genre: 'Soul', genre_key: 'soul', instrument: 'guitar', idx: 0,
+    });
+    // First song ends, one remains → the strip advances, no completion.
+    t.onGigSongEnded();
+    assert.equal(t.getGigRun().idx, 1);
+    // Stop while the queue is still active (end-of-song teardown) → run survives.
+    t.onGigSongStop();
+    assert.notEqual(t.getGigRun(), null);
+    // User quits: queue cleared → stop with a dead queue abandons (no log).
+    remaining = 0;
+    t.onGigSongStop();
+    assert.equal(t.getGigRun(), null);
+});
+
+test('a gold upgrade notifies even when the bronze moment was already seen', () => {
+    // Bronze seen under the legacy un-suffixed id; the badge then turns gold.
+    const w = load({ 'feedBack-career-badges-seen': '{"guitar/blues":1}' });
+    const t = w.__careerPassportTest;
+    const view = { instruments: { guitar: { passports: [
+        { genre_key: 'blues', genre: 'Blues', badge: 'gold' }] } } };
+    t.detectNewBadges(view);
+    assert.equal(w.notifications.length, 1);
+    assert.match(w.notifications[0].title, /Gold/);
+    // Same session: no duplicate.
+    t.detectNewBadges(view);
+    assert.equal(w.notifications.length, 1);
+    // Gold slam seen → fresh session stays silent.
+    t.markBadgeSeen('guitar', 'blues', 'gold');
+    const w2 = load({ 'feedBack-career-badges-seen': JSON.stringify(t.seenBadges()) });
+    w2.__careerPassportTest.detectNewBadges(view);
+    assert.equal(w2.notifications.length, 0);
+});
+
+test('a gold slam marks the bronze moment seen too — never both ceremonies', () => {
+    const w = load();
+    const t = w.__careerPassportTest;
+    t.markBadgeSeen('guitar', 'blues', 'gold');
+    const seen = JSON.parse(JSON.stringify(t.seenBadges()));
+    assert.equal(seen['guitar/blues@gold'], 1);
+    assert.equal(seen['guitar/blues'], 1);
+    // A later view where the badge reads 'earned' (e.g. gold state lost
+    // server-side) must not replay the bronze ceremony.
+    const view = { instruments: { guitar: { passports: [
+        { genre_key: 'blues', genre: 'Blues', badge: 'earned' }] } } };
+    const w2 = load({ 'feedBack-career-badges-seen': JSON.stringify(seen) });
+    w2.__careerPassportTest.detectNewBadges(view);
+    assert.equal(w2.notifications.length, 0);
+});
+
+test('careerTotals counts gold badges on the wall', () => {
+    const t = load().__careerPassportTest;
+    t.setView({
+        config: { instruments: ['guitar'] },
+        instruments: { guitar: { committed_at: 1, gig_count: 0, passports: [
+            { genre_key: 'blues', genre: 'Blues', badge: 'gold', seconds_total: 60 },
+            { genre_key: 'funk', genre: 'Funk', badge: 'in_progress', seconds_total: 0 },
+        ] } },
+    });
+    const totals = t.careerTotals();
+    assert.equal(totals.badges, 1);
+    assert.equal(totals.walls[0].earned[0].badge, 'gold');
 });

plugins/career/venue-packs/arena/manifest.json

@@ -0,0 +1,8 @@
+{
+    "venue": "arena",
+    "version": 1,
+    "loops": {"bored": "bored.mp4", "neutral": "neutral.mp4", "engaged": "engaged.mp4", "ecstatic": "ecstatic.mp4"},
+    "stingers": {"clap": "clap.mp4", "cheer": "cheer.mp4"},
+    "intro": {"video": "intro.mp4", "audio": "arena-ambience.mp3"},
+    "sfx": {"up": "sfx-up.mp3", "down": "sfx-down.mp3"}
+}

plugins/career/venue-packs/bar/manifest.json

@@ -14,5 +14,9 @@
     "intro": {
         "video": "intro.mp4",
         "audio": "bar-ambience.mp3"
+    },
+    "sfx": {
+        "up": "sfx-up.mp3",
+        "down": "sfx-down.mp3"
     }
 }

plugins/career/venue-packs/club/manifest.json

@@ -0,0 +1,8 @@
+{
+    "venue": "club",
+    "version": 1,
+    "loops": {"bored": "bored.mp4", "neutral": "neutral.mp4", "engaged": "engaged.mp4", "ecstatic": "ecstatic.mp4"},
+    "stingers": {"clap": "clap.mp4", "cheer": "cheer.mp4"},
+    "intro": {"video": "intro.mp4", "audio": "club-ambience.mp3"},
+    "sfx": {"up": "sfx-up.mp3", "down": "sfx-down.mp3"}
+}

plugins/folder_library/screen.js

@@ -878,6 +878,146 @@ function createFolderSurface(cfg) {
     var _dragRafId         = null;
     var _DRAG_THRESH = 5, _DRAG_ZONE = 150, _DRAG_SPEED = 50;
 
+    // ── Windowed song lists ─────────────────────────────────────────────
+    // A song list used to render EVERY song it held. On a flat 50,944-song
+    // library that is one <div> with 50,938 children and ~1.3 MILLION DOM nodes
+    // (~25 per row) — ~4.2 GB of renderer RSS, for a screen the user may not
+    // even be looking at. It also poisons unrelated code: any
+    // `document.querySelector` miss anywhere in the app must walk that whole
+    // tree, which is how song_preview's per-frame menu check ended up eating
+    // ~50% of the renderer and dropping the app to 2.7 fps (feedBack#965).
+    //
+    // So render only what is on screen. Rows are uniform height (and grid cards
+    // uniform size), so the window is pure arithmetic — no per-row observers.
+    // Off-window rows are represented by padding on the list itself rather than
+    // spacer elements: a spacer <div> would become a grid ITEM in grid view and
+    // shift the columns, whereas padding works identically for both layouts.
+    var VIRTUAL_MIN = 200;   // below this, render everything — no behaviour change
+    var VIRTUAL_BUFFER = 6;  // rows kept rendered above/below the viewport
+    var _virtualCleanups = [];
+    var _virtualLists = [];   // repaint fns, one per live windowed list
+
+    // Which slice of the list is on screen. Pure arithmetic — kept separate from
+    // the DOM so it can be tested directly (see tests/virtual_list.test.js).
+    //
+    //   top   : list's offset relative to the scroller viewport's top. NEGATIVE
+    //           once the user has scrolled the list's start above the fold.
+    //   rows  : total ROWS (grid packs `perRow` songs into one row; list view is 1)
+    //
+    // Returns the song index range [start, end) to render, plus how many ROWS of
+    // padding stand in for the songs above and below it.
+    function _visibleWindow(top, viewportH, itemH, perRow, rows, total) {
+        if (!(itemH > 0) || !(rows > 0)) return { start: 0, end: total, padRowsTop: 0, padRowsBottom: 0 };
+        var firstRow = Math.max(0, Math.floor(-top / itemH) - VIRTUAL_BUFFER);
+        var lastRow = Math.min(rows, Math.ceil((-top + viewportH) / itemH) + VIRTUAL_BUFFER);
+        // Scrolled entirely past the list (either direction): keep one row alive
+        // rather than emptying it, so the padding math stays anchored.
+        if (lastRow <= firstRow) {
+            firstRow = Math.min(firstRow, rows - 1);
+            lastRow = firstRow + 1;
+        }
+        return {
+            start: firstRow * perRow,
+            end: Math.min(total, lastRow * perRow),
+            padRowsTop: firstRow,
+            padRowsBottom: Math.max(0, rows - lastRow),
+        };
+    }
+
+    function _clearVirtualLists() {
+        _virtualCleanups.forEach(function (fn) { try { fn(); } catch (_) {} });
+        _virtualCleanups = [];
+        _virtualLists = [];
+    }
+
+    // Fill `list` with `songs`, windowed when the list is big enough to matter.
+    // `make(song)` builds one row/card.
+    function _fillSongList(list, songs, make) {
+        var sorted = _sortSongs(songs);
+        if (sorted.length <= VIRTUAL_MIN) {
+            sorted.forEach(function (s) { list.appendChild(make(s)); });
+            return;
+        }
+
+        var scroller = _getScrollEl();
+        var basePadTop = parseFloat(window.getComputedStyle(list).paddingTop) || 0;
+        var basePadBot = parseFloat(window.getComputedStyle(list).paddingBottom) || 0;
+
+        // Measure one real row once — no hardcoded row height to drift out of
+        // sync with the CSS. (The list is shown before it is populated, so this
+        // measures a laid-out row, not a zero-height one.)
+        var probe = make(sorted[0]);
+        probe.style.visibility = 'hidden';
+        list.appendChild(probe);
+        var probeRect = probe.getBoundingClientRect();
+        var rowH = probeRect.height || 44;
+        var cardW = probeRect.width || 150;
+        list.removeChild(probe);
+
+        var GRID_GAP = 12;   // matches the grid's `gap:12px`
+        var raf = 0, lastStart = -1, lastEnd = -1;
+
+        // Recomputed on EVERY paint, not captured once: a window resize changes
+        // the grid's column count, and therefore the row count and the height of
+        // the padding standing in for off-window rows. paint() runs on resize, so
+        // stale metrics would slice the wrong songs and mis-size the list.
+        function metrics() {
+            var perRow = 1, itemH = rowH;
+            if (_view === 'grid') {
+                perRow = Math.max(1, Math.floor((list.clientWidth + GRID_GAP) / (cardW + GRID_GAP)));
+                itemH = rowH + GRID_GAP;
+            }
+            return { perRow: perRow, itemH: itemH, rows: Math.ceil(sorted.length / perRow) };
+        }
+
+        function paint() {
+            raf = 0;
+            // Collapsed (display:none) or detached: nothing to paint, and don't
+            // pay for layout on every scroll tick of a section nobody can see.
+            // Forget the last window so re-showing repaints from scratch against
+            // the new position rather than short-circuiting on a stale memo.
+            if (!list.isConnected || list.offsetParent === null) {
+                lastStart = -1; lastEnd = -1;
+                return;
+            }
+            var m = metrics();
+            // Where the list sits relative to the scroller's viewport.
+            var top = list.getBoundingClientRect().top - scroller.getBoundingClientRect().top;
+            var vh = scroller.clientHeight || window.innerHeight;
+            var w = _visibleWindow(top, vh, m.itemH, m.perRow, m.rows, sorted.length);
+            if (w.start === lastStart && w.end === lastEnd) return;   // nothing moved
+            lastStart = w.start; lastEnd = w.end;
+
+            var frag = document.createDocumentFragment();
+            for (var i = w.start; i < w.end; i++) frag.appendChild(make(sorted[i]));
+            list.textContent = '';
+            list.style.paddingTop = (basePadTop + w.padRowsTop * m.itemH) + 'px';
+            list.style.paddingBottom = (basePadBot + w.padRowsBottom * m.itemH) + 'px';
+            list.appendChild(frag);
+        }
+        function schedule() { if (!raf) raf = window.requestAnimationFrame(paint); }
+
+        scroller.addEventListener('scroll', schedule, { passive: true });
+        window.addEventListener('resize', schedule);
+        // Expanding or collapsing ANY section moves every list below it. Those
+        // lists' windows are computed from their position, so they must repaint
+        // too — otherwise they keep the window from their old position and show
+        // blank padding where songs should be until the user happens to scroll.
+        _virtualLists.push(schedule);
+        _virtualCleanups.push(function () {
+            scroller.removeEventListener('scroll', schedule);
+            window.removeEventListener('resize', schedule);
+            if (raf) window.cancelAnimationFrame(raf);
+        });
+        paint();
+    }
+
+    // Re-window every live list — call after anything that can move them
+    // vertically (a folder expanding/collapsing, a section being shown).
+    function _repaintVirtualLists() {
+        _virtualLists.forEach(function (fn) { try { fn(); } catch (_) {} });
+    }
+
     function _getScrollEl() {
         var el = _treeEl();
         while (el && el !== document.documentElement) {
@@ -1159,8 +1299,8 @@ function createFolderSurface(cfg) {
 
         var _listPopulated = open;
         function _populateList() {
-            _sortSongs(folder.songs).forEach(function (s) {
-                list.appendChild(_view === 'grid' ? _songCard(s, folder.path) : _songRow(s, folder.path));
+            _fillSongList(list, folder.songs, function (s) {
+                return _view === 'grid' ? _songCard(s, folder.path) : _songRow(s, folder.path);
             });
             (folder.children || []).forEach(function (child) {
                 childrenWrap.appendChild(_folderSection(child, depth + 1));
@@ -1195,12 +1335,18 @@ function createFolderSurface(cfg) {
         hdr.addEventListener('click', function () {
             if (_query()) return;
             var nowOpen = content.style.display === 'none';
-            if (nowOpen && !_listPopulated) { _populateList(); _listPopulated = true; }
+            // Show BEFORE populating: a windowed list measures a real row and the
+            // scroller viewport, and both are zero while display:none.
             content.style.display = nowOpen ? '' : 'none';
+            if (nowOpen && !_listPopulated) { _populateList(); _listPopulated = true; }
             chev.style.transform  = nowOpen ? 'rotate(90deg)' : '';
             if (nowOpen) _openFolders.add(folder.path);
             else         _openFolders.delete(folder.path);
             _storeJSON('open', [..._openFolders]);
+            // This toggle moved everything below it — re-window the other lists,
+            // and re-window THIS one if it was already populated (its saved
+            // window was computed at its old position).
+            _repaintVirtualLists();
         });
 
         wrap.appendChild(hdr); wrap.appendChild(content);
@@ -1245,8 +1391,8 @@ function createFolderSurface(cfg) {
         }
         var _populated = _unsortedOpen;
         function _populate() {
-            _sortSongs(songs).forEach(function (s) {
-                list.appendChild(_view === 'grid' ? _songCard(s, '') : _songRow(s, ''));
+            _fillSongList(list, songs, function (s) {
+                return _view === 'grid' ? _songCard(s, '') : _songRow(s, '');
             });
         }
         if (_unsortedOpen) { _populate(); } else { list.style.display = 'none'; }
@@ -1255,10 +1401,12 @@ function createFolderSurface(cfg) {
         hdr.addEventListener('click', function () {
             if (_query()) return;
             _unsortedOpen = list.style.display === 'none';
-            if (_unsortedOpen && !_populated) { _populate(); _populated = true; }
+            // Show BEFORE populating — see the folder toggle above.
             list.style.display = _unsortedOpen ? (_view === 'grid' ? 'grid' : '') : 'none';
+            if (_unsortedOpen && !_populated) { _populate(); _populated = true; }
             chev.style.transform = _unsortedOpen ? 'rotate(90deg)' : '';
             _store(cfg.unsortedKey, String(_unsortedOpen));
+            _repaintVirtualLists();   // this toggle moved every list below it
         });
 
         wrap.appendChild(hdr); wrap.appendChild(list);
@@ -1340,6 +1488,10 @@ function createFolderSurface(cfg) {
     // ── Render ──────────────────────────────────────────────────────────
     function _render() {
         _hoveredFolder = null; // DOM is rebuilt; discard any stale reference
+        // Drop the scroll listeners of the previous render's windowed lists —
+        // their `list` nodes are about to be detached, and a surviving listener
+        // would keep painting into orphaned DOM (and leak on every re-render).
+        _clearVirtualLists();
         var treeEl = _treeEl();
         if (!treeEl) return;
         var data = _filtered();
@@ -1451,6 +1603,7 @@ function createFolderSurface(cfg) {
 
     // ── Unload (lib surface) ────────────────────────────────────────────
     function _unload() {
+        _clearVirtualLists();   // don't leave scroll listeners behind on teardown
         if (!cfg.searchInputId) return;
         var el = _el(cfg.searchInputId);
         if (el) el.style.maxWidth = '';
@@ -1554,6 +1707,8 @@ function createFolderSurface(cfg) {
         init: _init,
         onScreenChanged: _onScreenChanged,
         render: _render,
+        // Pure window arithmetic, exposed for tests (no DOM needed).
+        __test: { visibleWindow: _visibleWindow, VIRTUAL_MIN: VIRTUAL_MIN, VIRTUAL_BUFFER: VIRTUAL_BUFFER },
     };
 }
 
@@ -1656,6 +1811,7 @@ if (!window.__folderLibraryLib) {
     window.folderLibrary = {
         load:   function (force) { return _lib.load(force); },
         unload: function ()      { _lib.unload(); },
+        __test: _lib.__test,
     };
 
     // Auto-load if folder view was already active when this script was injected.

plugins/folder_library/tests/virtual_list.test.js

@@ -0,0 +1,165 @@
+// Windowed song lists (feedBack#965).
+//
+// A song list used to render EVERY song. On a flat 50,944-song library that is
+// one div with 50,938 children and ~1.3 MILLION DOM nodes (~25 per row) —
+// ~4.2 GB of renderer RSS, for a screen the user may not even be looking at. It
+// also poisoned unrelated code: any `document.querySelector` miss anywhere in
+// the app had to walk that whole tree.
+//
+// _visibleWindow is the arithmetic that decides which slice is on screen. If it
+// is wrong the list silently shows the wrong songs, or scrolls to the wrong
+// place, so it is tested directly — the DOM glue around it is not the risky bit.
+
+const { test } = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const vm = require('node:vm');
+
+function load() {
+    const window = {
+        console,
+        document: {
+            readyState: 'complete',
+            addEventListener() {},
+            getElementById() { return null; },
+            querySelector() { return null; },
+            querySelectorAll() { return []; },
+            createElement() { return { style: {}, classList: { add() {}, remove() {}, contains() { return false; } }, addEventListener() {}, appendChild() {} }; },
+        },
+        addEventListener() {},
+        localStorage: { getItem() { return null; }, setItem() {} },
+        performance: { now: () => 0 },
+        setInterval() { return 0; },
+        clearInterval() {},
+        requestAnimationFrame() { return 0; },
+        cancelAnimationFrame() {},
+        getComputedStyle() { return { overflowY: 'visible', paddingTop: '0px', paddingBottom: '0px' }; },
+        innerHeight: 800,
+    };
+    window.window = window;
+    window.globalThis = window;
+    const ctx = vm.createContext(window);
+    vm.runInContext(fs.readFileSync(path.join(__dirname, '..', 'screen.js'), 'utf8'), ctx, { filename: 'screen.js' });
+    assert.ok(window.folderLibrary && window.folderLibrary.__test, 'plugin must expose __test');
+    return window.folderLibrary.__test;
+}
+
+const { visibleWindow, VIRTUAL_BUFFER, VIRTUAL_MIN } = load();
+
+// A flat 50k library in list view: 1 song per row, 44px rows, 800px viewport.
+const ROW = 44;
+const VH = 800;
+const TOTAL = 50938;
+
+test('the whole point: a 50k list renders a bounded window, not 50k rows', () => {
+    const w = visibleWindow(0, VH, ROW, 1, TOTAL, TOTAL);
+    const rendered = w.end - w.start;
+    assert.ok(rendered < 60, `expected a small window, got ${rendered} rows`);
+    // ~18 rows fit in 800px, plus buffer above and below.
+    assert.ok(rendered >= Math.ceil(VH / ROW), 'must at least fill the viewport');
+});
+
+test('at the top: starts at 0, all remaining rows are bottom padding', () => {
+    const w = visibleWindow(0, VH, ROW, 1, TOTAL, TOTAL);
+    assert.equal(w.start, 0);
+    assert.equal(w.padRowsTop, 0);
+    assert.equal(w.padRowsBottom, TOTAL - w.end);
+});
+
+test('scrolled into the middle: window tracks the scroll, padding adds up', () => {
+    const scrolled = 10000 * ROW;                 // row 10,000 at the fold
+    const w = visibleWindow(-scrolled, VH, ROW, 1, TOTAL, TOTAL);
+    assert.equal(w.start, (10000 - VIRTUAL_BUFFER) * 1);
+    assert.ok(w.end > w.start);
+    // The invariant that keeps the scrollbar honest: padding rows + rendered
+    // rows must account for every song, or the list changes height as you scroll.
+    assert.equal(w.padRowsTop + (w.end - w.start) + w.padRowsBottom, TOTAL);
+});
+
+test('at the very bottom: no bottom padding, end lands on the last song', () => {
+    const rows = TOTAL;
+    const scrolled = rows * ROW - VH;             // scrolled to the end
+    const w = visibleWindow(-scrolled, VH, ROW, 1, rows, TOTAL);
+    assert.equal(w.end, TOTAL);
+    assert.equal(w.padRowsBottom, 0);
+    assert.equal(w.padRowsTop + (w.end - w.start), TOTAL);
+});
+
+test('grid view: perRow songs collapse into one row', () => {
+    const perRow = 6;
+    const rows = Math.ceil(TOTAL / perRow);
+    const w = visibleWindow(0, VH, 190, perRow, rows, TOTAL);
+    assert.equal(w.start, 0);
+    assert.equal(w.start % perRow, 0, 'a window must start on a row boundary');
+    assert.ok(w.end <= TOTAL);
+    assert.ok((w.end - w.start) < 200, 'grid window must stay bounded');
+});
+
+test('scrolled far past the list: keeps one row, never a negative window', () => {
+    const w = visibleWindow(-99999999, VH, ROW, 1, TOTAL, TOTAL);
+    assert.ok(w.end > w.start, 'window must never invert');
+    assert.ok(w.start >= 0 && w.end <= TOTAL);
+    assert.equal(w.padRowsTop + (w.end - w.start) + w.padRowsBottom, TOTAL);
+});
+
+test('list not yet scrolled to (below the fold): still yields a valid window', () => {
+    const w = visibleWindow(5000, VH, ROW, 1, TOTAL, TOTAL);   // list starts below viewport
+    assert.equal(w.start, 0);
+    assert.ok(w.end > 0);
+});
+
+test('degenerate inputs fall back to rendering everything, never to a broken window', () => {
+    // Measured height of 0 (e.g. list still display:none) must not divide by zero
+    // and must not silently render an empty list.
+    const w = visibleWindow(0, VH, 0, 1, TOTAL, TOTAL);
+    assert.equal(w.start, 0);
+    assert.equal(w.end, TOTAL);
+    assert.equal(w.padRowsTop, 0);
+    assert.equal(w.padRowsBottom, 0);
+});
+
+test('small lists are below the virtualization threshold', () => {
+    assert.ok(VIRTUAL_MIN >= 100, 'threshold must be high enough that normal folders are untouched');
+});
+
+// ── the grid must be re-measured when the window resizes (CodeRabbit, #967) ──
+// perRow and rows were originally captured once at fill time. paint() also runs
+// on resize, so a narrower/wider window changed the column count while the
+// window maths still used the OLD one — slicing the wrong songs and mis-sizing
+// the padding. These pin that the geometry is a function of perRow, so a stale
+// perRow cannot silently survive.
+
+test('resizing the grid to fewer columns re-windows against the new row count', () => {
+    const total = 10000;
+    const wide = visibleWindow(0, VH, 190, 6, Math.ceil(total / 6), total);
+    const narrow = visibleWindow(0, VH, 190, 3, Math.ceil(total / 3), total);
+
+    // Same viewport, half the columns -> about half as many songs on screen.
+    assert.ok(narrow.end < wide.end, 'fewer columns must render fewer songs per screen');
+    // ...and the total must still add up, or the scrollbar lies after a resize.
+    for (const [w, perRow] of [[wide, 6], [narrow, 3]]) {
+        const rows = Math.ceil(total / perRow);
+        assert.equal(w.padRowsTop + Math.ceil((w.end - w.start) / perRow) + w.padRowsBottom, rows,
+            `rows must account for every song at perRow=${perRow}`);
+    }
+});
+
+test('a stale perRow would break the total-height invariant (the bug)', () => {
+    const total = 10000;
+    // Grid re-laid out to 3 columns, but windowed with the OLD perRow of 6:
+    // the row count no longer matches the geometry, and the padding is wrong.
+    const stalePerRow = 6, actualRows = Math.ceil(total / 3);
+    const bad = visibleWindow(0, VH, 190, stalePerRow, actualRows, total);
+    const accounted = bad.padRowsTop + Math.ceil((bad.end - bad.start) / 3) + bad.padRowsBottom;
+    assert.notEqual(accounted, actualRows,
+        'this asserts the FAILURE mode: mismatched perRow/rows must not silently look correct — ' +
+        'metrics() recomputes both together on every paint so this cannot happen in practice');
+});
+
+test('scrolled grid window always starts on a row boundary', () => {
+    const total = 10000, perRow = 4;
+    const rows = Math.ceil(total / perRow);
+    const w = visibleWindow(-5000, VH, 190, perRow, rows, total);
+    assert.equal(w.start % perRow, 0, 'a partial row would shift every card in the grid');
+});

plugins/highway_3d/screen.js

@@ -15388,6 +15388,27 @@
                 });
             },
 
+            // The host throttles paused frames to ~10 fps, on the assumption
+            // that a paused chart is a static picture and re-rendering it is
+            // pure waste (highway-constants._PAUSED_FRAME_INTERVAL_MS).
+            //
+            // That stopped being true when the venue landed. The venue backdrop
+            // is a PLAYING VIDEO and the crowd reacts on its own clock, and they
+            // are drawn into this same canvas as the highway — so throttling the
+            // highway throttled the whole room. Pausing the song dropped the
+            // venue, the crowd and the stage to 10 fps.
+            //
+            // Only claim continuous frames while a crowd video is actually
+            // rolling: with no venue pack (the common case) the paused scene IS
+            // static and the throttle should still save the GPU.
+            needsContinuousFrames() {
+                if (!_isReady || _ctxLost) return false;
+                for (const v of _venueCrowdVideos) {
+                    if (v && !v.paused && !v.ended && v.readyState >= 2) return true;
+                }
+                return false;
+            },
+
             draw(bundle) {
                 if (!_isReady) return;
                 if (_ctxLost) return;   // GPU context lost (alt-tab / reset) — skip until restored

static/app.js

@@ -218,6 +218,7 @@ import {
     setAvOffsetMs,
     setInstrumentPathway,
     setupAppUpdates,
+    setupWindowOptions,
     syncDefaultArrangementPin,
 } from './js/settings.js';
 import {

static/highway.js

@@ -1159,6 +1159,17 @@ function createHighway() {
             ' (user ' + hwState._renderScale.toFixed(2) + ' / auto ' + hwState._autoScale.toFixed(2) + ')';
     }
 
+    // Optional renderer capability: "my picture keeps moving even when the chart
+    // clock is stopped". Anything a renderer animates on its own clock (the 3D
+    // highway's venue video + crowd) has to opt out of the paused-frame throttle
+    // or it renders at 10 fps while the song is paused. Absent / throwing =
+    // false, so every existing renderer keeps the throttle unchanged.
+    function _rendererNeedsContinuousFrames() {
+        const r = hwState._renderer;
+        if (!r || typeof r.needsContinuousFrames !== 'function') return false;
+        try { return r.needsContinuousFrames() === true; } catch (_) { return false; }
+    }
+
     function draw() {
         hwState.animFrame = requestAnimationFrame(draw);
         if (!hwState.canvas || !hwState._renderer) return;
@@ -1223,7 +1234,15 @@ function createHighway() {
             const _nowP = performance.now();
             if (_nowP - hwState._chartLastAdvanceAt > _CHART_MAX_INTERP_MS) {
                 _paused = true;
-                if (_nowP - hwState._lastPausedDrawAt < _PAUSED_FRAME_INTERVAL_MS) return;
+                // ...unless the renderer says its picture is NOT static while
+                // paused. The throttle assumes a paused chart is a still frame,
+                // but a renderer can own content on a clock of its own — the 3D
+                // highway draws the venue's video backdrop and its reactive crowd
+                // into this same canvas, so throttling the highway throttled the
+                // whole room to 10 fps whenever the song was paused. Optional
+                // method: renderers that don't implement it keep the throttle.
+                if (!_rendererNeedsContinuousFrames()
+                    && _nowP - hwState._lastPausedDrawAt < _PAUSED_FRAME_INTERVAL_MS) return;
                 hwState._lastPausedDrawAt = _nowP;
             }
         }
@@ -1908,17 +1927,21 @@ function createHighway() {
                                     // never routable.
                                     const isAudioUrl = msg.audio_url.startsWith('/audio/');
                                     // "Full mix" covers BOTH single-mix pack shapes:
-                                    //  - stem-less packs (original_audio: in the manifest,
-                                    //    audio_url == original_audio_url), and
-                                    //  - single-stem packs (stems: [full.ogg] only) — the server
-                                    //    puts the full mix in the stems list, has_original_audio
-                                    //    is false, and audio_url points at the one stem. With one
-                                    //    stem there is no per-stem mix to preserve, so routing it
-                                    //    natively loses nothing. Real multi-stem (>1) stays out
-                                    //    until Phase 2.
+                                    //  - single-stem packs (stems: [full.ogg] only) — the pack's
+                                    //    one stem IS its mixdown, so the server leaves it in the
+                                    //    stems list, has_full_mix is false, and audio_url points
+                                    //    at that one stem; and
+                                    //  - legacy stem-less packs, whose mixdown sits outside stems
+                                    //    behind the deprecated original_audio: key, so has_stems
+                                    //    is false and audio_url == full_mix_url.
+                                    // Either way there is one audible source and no per-stem mix
+                                    // to preserve, so routing it natively loses nothing. A pack
+                                    // that retains its `full` stem ALONGSIDE separated stems is
+                                    // multi-stem (has_full_mix && has_stems) and stays out until
+                                    // Phase 2 — routing it natively would drop the mixer.
                                     const isFeedpakFullMix = !isAudioUrl
                                         && msg.audio_url.startsWith('/api/sloppak/')
-                                        && ((!!msg.has_original_audio && !msg.has_stems)
+                                        && ((!!msg.has_full_mix && !msg.has_stems)
                                             || (msg.stems || []).length === 1);
                                     // Record the loaded song's audio so app.js can re-route it
                                     // between the HTML5 and JUCE paths if the audio engine is
@@ -1943,7 +1966,7 @@ function createHighway() {
                                         'isFeedpakFullMix=', isFeedpakFullMix,
                                         'has_stems=', !!msg.has_stems,
                                         'stems=', (msg.stems || []).length,
-                                        'has_original_audio=', !!msg.has_original_audio,
+                                        'has_full_mix=', !!msg.has_full_mix,
                                         'format=', msg.format,
                                         'alreadyLoaded=', alreadyLoaded,
                                         'juceApi=', !!window.feedBackDesktop?.audio);

static/js/blob-io.js

@@ -0,0 +1,28 @@
+// Blob export helpers — the download idiom that used to be duplicated in
+// settings-io.js and diagnostics-export.js, plus image-to-clipboard for
+// shareable cards/posters. A LEAF module: imports nothing. Classic-script
+// plugins reach it via dynamic import('/static/js/blob-io.js').
+
+export function downloadBlob(blob, filename) {
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = filename;
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    URL.revokeObjectURL(url);
+}
+
+// Copy an image blob to the system clipboard. Returns true on success, false
+// when the Clipboard API is unavailable or refuses (insecure context, no user
+// gesture, permission denied) — callers fall back to downloadBlob and say so.
+export async function copyImageBlob(blob) {
+    try {
+        if (!navigator.clipboard || typeof ClipboardItem === 'undefined') return false;
+        await navigator.clipboard.write([new ClipboardItem({ [blob.type || 'image/png']: blob })]);
+        return true;
+    } catch (_) {
+        return false;
+    }
+}

static/js/diagnostics-export.js

@@ -21,6 +21,8 @@
 //      redact toggles.
 //   3. Stream the returned zip to disk.
 
+import { downloadBlob } from './blob-io.js';
+
 function _diagIncludeFromUI() {
     const v = (id) => document.getElementById(id)?.checked !== false;
     return {
@@ -265,14 +267,7 @@ export async function exportDiagnostics() {
     }
     try {
         const blob = await resp.blob();
-        const url = URL.createObjectURL(blob);
-        const a = document.createElement('a');
-        a.href = url;
-        a.download = filename;
-        document.body.appendChild(a);
-        a.click();
-        document.body.removeChild(a);
-        URL.revokeObjectURL(url);
+        downloadBlob(blob, filename);
         status.textContent = `Exported ${filename}`;
     } catch (e) {
         status.textContent = `Export failed during download: ${e.message}`;

static/js/settings-io.js

@@ -1,6 +1,6 @@
 // Settings backup — the export / import bundle.
 //
-// Carved verbatim out of static/app.js (R3a). A LEAF module: imports nothing.
+// Carved verbatim out of static/app.js (R3a). Imports only the blob-io leaf.
 //
 // Two entry points, both inline handlers on the Settings screen, so app.js keeps
 // re-exposing them on window. The import is two-phase (server first, atomic; then
@@ -29,6 +29,8 @@
 // phase 2; the localStorage side is best-effort merge after server
 // success. Failures are reported, never silenced.
 
+import { downloadBlob } from './blob-io.js';
+
 export async function exportSettings() {
     const status = document.getElementById('backup-status');
     status.textContent = 'Exporting...';
@@ -66,14 +68,7 @@ export async function exportSettings() {
             if (match) filename = match[1];
         }
         const blob = new Blob([JSON.stringify(bundle, null, 2)], { type: 'application/json' });
-        const url = URL.createObjectURL(blob);
-        const a = document.createElement('a');
-        a.href = url;
-        a.download = filename;
-        document.body.appendChild(a);
-        a.click();
-        document.body.removeChild(a);
-        URL.revokeObjectURL(url);
+        downloadBlob(blob, filename);
         status.textContent = `Exported ${filename}`;
     } catch (e) {
         status.textContent = `Export failed: ${e.message}`;

static/js/settings.js

@@ -100,6 +100,7 @@ export async function loadSettings() {
     // failed fetch below still leaves the desktop updater wired up.
     // setupAppUpdates() is idempotent via _appUpdatesWired.
     setupAppUpdates();
+    setupWindowOptions();
     const resp = await fetch('/api/settings');
     const data = await resp.json();
     // Null-guard the form fields: on the v3 tabbed settings page the markup is
@@ -167,6 +168,47 @@ export async function loadSettings() {
     hwcInitSettingsUI();
 }
 
+// ── Window options (desktop-only) ────────────────────────────────────────
+// Desktop-only window preferences (start-in-fullscreen, …). The whole block
+// stays hidden in the plain web / Docker app; unhide + wire only when the
+// feedBack-desktop bridge (window.feedBackDesktop.window) exposes the getter
+// and setter. Persistence lives desktop-side because only the Electron main
+// process can read the pref at window-creation time — core just proxies.
+export let _windowOptionsWired = false;
+
+export function setupWindowOptions() {
+    const block = document.getElementById('window-options-block');
+    if (!block) return;
+    const winApi = window.feedBackDesktop?.window;
+    // Per-method capability check: a partial/older bridge may expose `window`
+    // without this shape. Leave the block hidden rather than half-wiring it.
+    if (!winApi
+        || typeof winApi.getStartFullscreen !== 'function'
+        || typeof winApi.setStartFullscreen !== 'function') {
+        return;
+    }
+
+    block.classList.remove('hidden');
+
+    const cb = document.getElementById('setting-start-fullscreen');
+    if (!cb) return;
+
+    // Hydrate from the desktop-persisted value. The getter may be sync or
+    // async (IPC round-trip); Promise.resolve normalises both.
+    Promise.resolve(winApi.getStartFullscreen()).then(function (on) {
+        cb.checked = !!on;
+    }).catch(function () { /* leave unchecked on error */ });
+
+    // Guard only the listener against double-binding; unhide + re-hydrate
+    // stay idempotent so re-entering Settings refreshes the checkbox.
+    if (!_windowOptionsWired) {
+        _windowOptionsWired = true;
+        cb.addEventListener('change', function () {
+            try { winApi.setStartFullscreen(cb.checked); } catch (_) { /* best-effort */ }
+        });
+    }
+}
+
 export const APP_UPDATE_CHANNELS = ['stable', 'rc', 'beta', 'alpha'];
 
 export let _appUpdatesWired = false;

static/v3/badges.js

@@ -120,11 +120,20 @@
             if (!r.ok) return;
             const data = await r.json();
             _tuningsByKey = data.tunings || {};
-            // Build TUNING_NOTE from the first (lowest) string frequency of each tuning.
+            // Build TUNING_NOTE from the lowest string of each tuning. Prefer the
+            // exact integer midis the server now sends (tuningMidis, #829) — the
+            // frequency path reconstructs the note via log2 against a hardcoded
+            // 440 and can land a semitone off at non-440 reference pitches.
+            // Frequencies remain the fallback for older cached responses.
+            const midisByKey = data.tuningMidis || {};
             TUNING_NOTE = {};
             for (const key of Object.keys(_tuningsByKey)) {
                 for (const [name, freqs] of Object.entries(_tuningsByKey[key])) {
-                    if (!(name in TUNING_NOTE) && Array.isArray(freqs) && freqs.length > 0) {
+                    if (name in TUNING_NOTE) continue;
+                    const midis = midisByKey[key] && midisByKey[key][name];
+                    if (Array.isArray(midis) && midis.length > 0 && Number.isFinite(midis[0])) {
+                        TUNING_NOTE[name] = NOTE_NAMES[((midis[0] % 12) + 12) % 12];
+                    } else if (Array.isArray(freqs) && freqs.length > 0) {
                         TUNING_NOTE[name] = _freqToNote(freqs[0]);
                     }
                 }

static/v3/dashboard.js

@@ -208,12 +208,17 @@
             '</div></div></div>' +
             continueCard +
             '</div>' +
-            // Stats row
+            // Stats row. The third slot belongs to the career plugin (it
+            // replaces the slot's content on v3:dashboard-rendered); the
+            // plugin-count stat is the built-in fallback when career is
+            // absent or has no state yet.
             '<div class="grid md:grid-cols-3 gap-6 mt-6">' +
             audioRoutingCard() +
             statCard(String(songCount), 'songs', 'text-fb-gold') +
+            '<div id="v3-dash-career-slot" class="grid">' +
             statCard(String(pluginCount), 'active', 'text-fb-good') +
             '</div>' +
+            '</div>' +
             recentSection +
             '</div>';
 

static/v3/index.html

@@ -753,6 +753,21 @@
                             <a href="https://github.com/got-feedback/feedback-desktop/releases" target="_blank" rel="noopener" class="text-accent hover:text-accent-light underline">download new versions from GitHub Releases</a>.
                         </p>
                     </div>
+                    <!-- Window options — desktop-only; setupWindowOptions() unhides. -->
+                    <div id="window-options-block" class="hidden">
+                        <div class="fb-srow">
+                            <div class="fb-srow-main">
+                                <div class="fb-srow-title">Fullscreen</div>
+                                <div class="fb-srow-desc">Run fee[dB]ack in fullscreen mode. On macOS, changes take effect on the next launch.</div>
+                            </div>
+                            <div class="fb-srow-control">
+                                <label class="fb-switch">
+                                    <input type="checkbox" id="setting-start-fullscreen">
+                                    <span class="fb-switch-track"></span>
+                                </label>
+                            </div>
+                        </div>
+                    </div>
                     <!-- Library folder path -->
                     <div class="fb-srow fb-srow-stack">
                         <div class="fb-srow-main">

static/v3/profile.js

@@ -191,6 +191,10 @@
             '<div class="space-y-6">' +
             headerCard +
             bestsCard +
+            // Passport wall — rendered by the career plugin on
+            // v3:profile-rendered (absent-not-empty: nothing shows until a
+            // passport exists).
+            '<div id="v3-profile-passports-mount"></div>' +
             // Feats of Power trophy shelf — rendered by the achievements plugin
             // (earned Feats only; hidden-until-earned, so empty when none).
             '<div id="v3-profile-feats-slot"></div>' +

static/v3/stats-recorder.js

@@ -27,7 +27,60 @@
     let cur = null;             // active session
     let recordedThisSession = false;
 
+    // Wall-clock play time (career hours odometer). Accrued across
+    // play/resume ↔ pause/stop/ended spans — wall time, NOT song position:
+    // position deltas double-count A-B loops and mis-read seeks.
+    let playingSince = 0;       // performance.now() at span start, 0 while not playing
+    let accruedSeconds = 0;     // played time not yet sent
+    // Failed seconds keep their song identity — restoring them into the
+    // global accumulator would let the NEXT song claim them after a session
+    // switch. Bounded; oldest dropped beyond the cap (honest loss beats
+    // misattribution).
+    let pendingSeconds = [];    // [{filename, arrangement, seconds}] awaiting retry
+
+    function queuePendingSeconds(filename, arrangement, seconds) {
+        pendingSeconds.push({ filename, arrangement, seconds });
+        if (pendingSeconds.length > 20) pendingSeconds.shift();
+    }
+
+    function retryPendingSeconds() {
+        if (!pendingSeconds.length) return;
+        const batch = pendingSeconds;
+        pendingSeconds = [];
+        for (const body of batch) {
+            post(body).then((r) => { if (r == null) queuePendingSeconds(body.filename, body.arrangement, body.seconds); });
+        }
+    }
+
+    function clockStart() { if (!playingSince) playingSince = performance.now(); }
+    function clockStop() {
+        if (!playingSince) return;
+        const delta = (performance.now() - playingSince) / 1000;
+        playingSince = 0;
+        // A single unbroken span beyond 2h of wall clock is a suspend/sleep
+        // artifact, not practice — clamp it.
+        if (Number.isFinite(delta) && delta > 0) accruedSeconds += Math.min(delta, 7200);
+    }
+    // Take whatever has accrued (closing any open span) for sending; the
+    // caller restores it if the POST fails so the time isn't lost.
+    function takeSeconds() {
+        clockStop();
+        const s = Math.round(accruedSeconds);
+        accruedSeconds = 0;
+        return s > 0 ? s : 0;
+    }
+    // Unsent seconds belong to the outgoing song/arrangement — flush before
+    // a session reset would re-attribute them.
+    function flushSeconds() {
+        const s = takeSeconds();
+        if (!s) return;
+        if (!cur || !cur.filename) return; // no session to attribute to — drop
+        const body = { filename: cur.filename, arrangement: cur.arrangement, seconds: s };
+        post(body).then((r) => { if (r == null) queuePendingSeconds(body.filename, body.arrangement, s); });
+    }
+
     function reset(filename, arrangement) {
+        flushSeconds();
         cur = {
             filename: filename || null,
             arrangement: Number.isFinite(arrangement) ? arrangement : 0,
@@ -48,6 +101,10 @@
                 headers: { 'Content-Type': 'application/json' },
                 body: JSON.stringify(body),
             });
+            // A 4xx/5xx JSON error body must read as FAILURE — callers
+            // re-queue accrued seconds on null, and a parsed error object
+            // would silently drop them.
+            if (!r.ok) return null;
             try { return await r.json(); } catch (e) { return null; }
         } catch (e) { return null; /* offline / endpoint absent — non-fatal */ }
     }
@@ -84,6 +141,7 @@
         if (!cur || !cur.filename || recordedThisSession) return;
         if (!cur.scored || (cur.hits + cur.misses) <= 0) return;  // no real scoring this session
         recordedThisSession = true;
+        const seconds = takeSeconds();
         const body = {
             filename: cur.filename,
             arrangement: cur.arrangement,
@@ -94,7 +152,9 @@
             bestStreak: cur.bestStreak,
             lastPlayPosition: Number.isFinite(position) ? position : cur.lastTime,
         };
+        if (seconds) body.seconds = seconds;
         post(body).then(async (response) => {
+            if (response == null && seconds) queuePendingSeconds(body.filename, body.arrangement, seconds);
             await notifyProgression(response, body, !!natural);
             // Refresh the profile badge AFTER the progression state moved so
             // the rank/dB it renders are post-award values.
@@ -112,7 +172,10 @@
         // Allow 0: restarting a song and stopping at the very beginning must be
         // able to clear a stale Continue offset. Only negatives are invalid.
         if (!Number.isFinite(position) || position < 0) return;
-        post({ filename: cur.filename, arrangement: cur.arrangement, lastPlayPosition: position });
+        const seconds = takeSeconds();
+        const body = { filename: cur.filename, arrangement: cur.arrangement, lastPlayPosition: position };
+        if (seconds) body.seconds = seconds;
+        post(body).then((r) => { if (r == null && seconds) queuePendingSeconds(body.filename, body.arrangement, seconds); });
     }
 
     // ── Session lifecycle ─────────────────────────────────────────────────--
@@ -164,13 +227,28 @@
         });
     });
 
+    // ── Play-time clock ───────────────────────────────────────────────────--
+    sm.on('song:play', () => { clockStart(); retryPendingSeconds(); });
+    sm.on('song:resume', clockStart);
+
     // ── Finalize / resume-position ────────────────────────────────────────--
-    sm.on('song:ended', (e) => finalizeScored(e && e.detail && e.detail.time, true));
-    sm.on('song:pause', (e) => touchPosition(e && e.detail && e.detail.time));
+    sm.on('song:ended', (e) => {
+        clockStop();
+        finalizeScored(e && e.detail && e.detail.time, true);
+        // Unscored natural end: no finalize POST and no position touch
+        // (Continue must not point at the end of the song) — bank the play
+        // time on its own.
+        flushSeconds();
+    });
+    sm.on('song:pause', (e) => {
+        clockStop();
+        touchPosition(e && e.detail && e.detail.time);
+    });
     sm.on('song:stop', (e) => {
         // Record the scored session if it wasn't already (e.g. user closed the
         // player before the track ended), then persist the resume position.
         // Not a natural end — no calibration-retry prompt for deliberate quits.
+        clockStop();
         const t = e && e.detail && e.detail.time;
         finalizeScored(t, false);
         touchPosition(t);

static/v3/venue-crowd.js

@@ -34,6 +34,7 @@
     const STREAK_MILESTONES = [25, 50, 100];
     const CANPLAY_TIMEOUT_MS = 4000;
     const DEV_FLAG_KEY = 'feedBack-venue-crowd-dev';
+    const SFX_KEY = 'feedBack-venue-crowd-sfx';   // 'on' | 'off' (default off)
 
     // ---------------------------------------------------------------------
     // Pure, clock-injected decision logic (unit-tested in
@@ -58,6 +59,15 @@
                 candidate = null;
                 lastSwitchAt = -Infinity;
             },
+            // Commit a state NOW, bypassing stability/dwell (badge ceremony).
+            // Stamping lastSwitchAt makes the dwell window hold the forced
+            // state before the real perf machine can reassert.
+            force(state, nowMs) {
+                if (!CROWD_STATES.includes(state)) return;
+                current = state;
+                candidate = null;
+                lastSwitchAt = nowMs;
+            },
             // Feed the latest perf state; returns the new crowd state when a
             // transition commits, else null.
             update(perfState, nowMs) {
@@ -123,6 +133,11 @@
     let _lastStingerAt = -Infinity;
     let _prevStreak = 0;
     let _lastAccuracyPct = null; // from perf events; stats:recorded carries none
+    // Filename of the song song:loaded last reported. An arrangement switch
+    // re-emits song:loaded for the SAME file (changeArrangement reloads through
+    // the normal load path), and that must not be mistaken for arriving at the
+    // venue with a new song — see onSongLoaded.
+    let _lastSongFile = '';
     let _bound = false;
 
     function now() { return Date.now(); }
@@ -144,7 +159,11 @@
             video: abs(m.intro && m.intro.video),
             audio: abs(m.intro && m.intro.audio),
         };
-        return { loops, stingers, intro };
+        const sfx = {
+            up: abs(m.sfx && m.sfx.up),
+            down: abs(m.sfx && m.sfx.down),
+        };
+        return { loops, stingers, intro, sfx };
     }
 
     function ensureVideos() {
@@ -410,6 +429,30 @@
         return true;
     }
 
+    let _sfxEl = null;
+
+    function sfxEnabled() {
+        try { return localStorage.getItem(SFX_KEY) === 'on'; } catch (_) { return false; }
+    }
+
+    // One-shot crowd reaction on committed mood transitions (toggleable):
+    // up the ladder → cheer, down → boos. Committed transitions are already
+    // hysteresis-limited, so this can't spam.
+    function playMoodSfx(direction) {
+        if (!sfxEnabled() || !_manifest || !_manifest.sfx || _introActive) return;
+        const url = direction > 0 ? _manifest.sfx.up : _manifest.sfx.down;
+        if (!url || typeof document === 'undefined') return;
+        if (!_sfxEl) {
+            _sfxEl = document.createElement('audio');
+            _sfxEl.preload = 'auto';
+            _sfxEl.style.display = 'none';
+            document.body.appendChild(_sfxEl);
+        }
+        _sfxEl.src = url;
+        _sfxEl.volume = 0.6;
+        _sfxEl.play().catch(() => { /* pre-gesture; skip silently */ });
+    }
+
     function onSongPlay() {
         // Song audio starting is the hard cue: the ambience must yield.
         fadeAudioOut(1000);
@@ -430,18 +473,50 @@
         if (sting && !_introActive && CROWD_RANK[machine.current] >= CROWD_RANK.neutral) {
             playStinger(sting);
         }
+        const prevRank = CROWD_RANK[machine.current];
         const next = machine.update(d.state, now());
         if (next) {
+            playMoodSfx(CROWD_RANK[next] - prevRank);
             // A stinger or the intro owns the idle layer; defer the switch.
             if (_stingerUntilEnded || _introActive) _pendingLoop = next;
             else showLoop(next, FADE_MS);
         }
     }
 
-    function onSongLoaded() {
+    // song:loaded for the SAME file is an arrangement switch, not an arrival at
+    // the venue. changeArrangement() reloads through the normal load path, so
+    // the event is indistinguishable from a fresh load except by filename.
+    function isArrangementSwitch(prevFile, nextFile) {
+        return !!nextFile && nextFile === prevFile;
+    }
+
+    function onSongLoaded(song) {
+        const file = String((song && song.filename) || '');
+        const sameSong = isArrangementSwitch(_lastSongFile, file);
+        _lastSongFile = file;
+
         machine.reset();
         _prevStreak = 0;
         _lastAccuracyPct = null;
+
+        // Switching arrangement is NOT arriving at the venue.
+        //
+        // changeArrangement() reloads the song through the same path as a fresh
+        // load, so highway.js emits song:loaded again — same filename, new
+        // arrangement. Treated as a new song, that replayed the arrival flyover:
+        // the camera flew in from the back of the room again mid-set, every time
+        // the player switched from lead to rhythm. The player is already on
+        // stage; the room should just carry on.
+        //
+        // So keep the video pipeline running and only re-sync the mood: the
+        // performance restarts, so the loop must follow the reset machine (a
+        // quiet crossfade), never the intro.
+        if (sameSong) {
+            if (_venueActive && _manifest && !_introActive) showLoop(machine.current, FADE_MS);
+            return;
+        }
+
+        // A genuinely different song — full teardown.
         // Abort any stinger/pending state from the previous song: its ended
         // handler must not fade back into the old song's layers.
         cancelFade();
@@ -489,6 +564,7 @@
         _introGen++;
         _introActive = false;
         stopAudio();
+        if (_sfxEl && !_sfxEl.paused) _sfxEl.pause();
         _stingerUntilEnded = false;
         _pendingLoop = null;
         _loadingLoop = null;
@@ -564,6 +640,26 @@
         if (dev && !_manifest) setManifest(dev);
     }
 
+    // Badge-ceremony hook (career passports): the crowd erupts NOW — ecstatic
+    // loop bypassing stability/dwell (the dwell window then holds it while
+    // the real perf state waits its turn) plus a cheer. Degrades to a no-op
+    // without a pack / outside the player, like every other entry point.
+    function celebrate() {
+        if (!_venueActive || !_manifest || !_videos[0]) return false;
+        machine.force('ecstatic', now());
+        if (_stingerUntilEnded || _introActive) {
+            // A stinger/intro owns the idle layer (likely the end-of-song
+            // accuracy cheer — the crowd is already reacting); queue the
+            // ecstatic loop for when it ends, same as onPerformanceState.
+            _pendingLoop = 'ecstatic';
+        } else {
+            showLoop('ecstatic', FADE_MS);
+            _lastStingerAt = -Infinity; // a badge earn always gets its cheer
+            playStinger('cheer');
+        }
+        return true;
+    }
+
     function getState() {
         return {
             venueActive: _venueActive,
@@ -589,6 +685,8 @@
         setVenueActive,
         bindRuntime,
         getState,
+        celebrate,
+        isArrangementSwitch,
     };
 
     if (root) root.v3VenueCrowd = api;

static/v3/venue-scene-3d.js

@@ -18,6 +18,30 @@
     let _lastMood = 'idle';
     let _bound = false;
 
+    // The venue belongs to the SONG player and nowhere else.
+    //
+    // isVenueViz() only answers "is Venue the selected visualization" — a global
+    // preference. It says nothing about what is on screen. Other surfaces borrow
+    // the same highway_3d renderer (Virtuoso runs its practice charts on it), so
+    // with Venue selected they inherited the venue backdrop: the crowd and the
+    // stage showed up behind a chromatic exercise. The viz picker is a
+    // preference for the player; it is not a licence to paint the venue over
+    // whatever else happens to be using the renderer.
+    //
+    // So gate on both: Venue selected AND the player screen is the one showing.
+    function isPlayerScreen() {
+        try {
+            const active = document.querySelector('.screen.active');
+            return !!active && active.id === 'player';
+        } catch (_) {
+            return false;
+        }
+    }
+
+    function shouldBeActive() {
+        return isVenueViz() && isPlayerScreen();
+    }
+
     function isVenueViz() {
         if (root && root.v3VenueViz && typeof root.v3VenueViz.isVenueVisualization === 'function') {
             const sel = root.v3VenueViz.getSelectedVizId
@@ -146,7 +170,8 @@
 
     function syncViz(vizId) {
         const id = String(vizId || '');
-        if (id === 'venue') {
+        // Venue selected is necessary but not sufficient — see shouldBeActive.
+        if (id === 'venue' && isPlayerScreen()) {
             activate();
         } else {
             deactivate();
@@ -192,12 +217,19 @@
                 if (_active) syncInstrumentPov();
             });
             sm.on('viz:renderer:ready', () => {
-                if (isVenueViz()) activate();
+                if (shouldBeActive()) activate();
                 else deactivate();
             });
             sm.on('viz:reverted', () => deactivate());
+            // Leaving the player tears the venue down; coming back rebuilds it.
+            // Without this the backdrop followed the renderer onto every other
+            // surface that borrows it (Virtuoso's practice highway).
+            sm.on('screen:changed', () => {
+                if (shouldBeActive()) activate();
+                else deactivate();
+            });
         }
-        if (isVenueViz()) activate();
+        if (shouldBeActive()) activate();
     }
 
     function getState() {
@@ -234,6 +266,8 @@
         activate,
         deactivate,
         syncViz,
+        isPlayerScreen,
+        shouldBeActive,
         onAssetsLoaded,
         onAssetsFailed,
         onPerformanceState,

tests/js/career_plugin.test.js

@@ -51,6 +51,56 @@ test('bar venue pack ships with intro media in the plugin checkout', () => {
     }
 });
 
+test('arena venue pack ships with full media in the plugin checkout', () => {
+    const packDir = path.join(PLUGIN_DIR, 'venue-packs', 'arena');
+    const manifest = JSON.parse(fs.readFileSync(path.join(packDir, 'manifest.json'), 'utf8'));
+    assert.equal(manifest.venue, 'arena');
+    assert.deepEqual(manifest.loops, {
+        bored: 'bored.mp4', neutral: 'neutral.mp4',
+        engaged: 'engaged.mp4', ecstatic: 'ecstatic.mp4',
+    });
+    assert.deepEqual(manifest.stingers, { clap: 'clap.mp4', cheer: 'cheer.mp4' });
+    assert.deepEqual(manifest.sfx, { up: 'sfx-up.mp3', down: 'sfx-down.mp3' });
+    assert.equal(manifest.intro.video, 'intro.mp4');
+    assert.equal(manifest.intro.audio, 'arena-ambience.mp3');
+    for (const f of [
+        ...Object.values(manifest.loops),
+        ...Object.values(manifest.stingers),
+        manifest.intro.video,
+        manifest.intro.audio,
+        manifest.sfx.up,
+        manifest.sfx.down,
+    ]) {
+        const stat = fs.statSync(path.join(packDir, f));
+        assert.ok(stat.size > 0, `${f} must be present`);
+    }
+});
+
+test('club venue pack ships with full media in the plugin checkout', () => {
+    const packDir = path.join(PLUGIN_DIR, 'venue-packs', 'club');
+    const manifest = JSON.parse(fs.readFileSync(path.join(packDir, 'manifest.json'), 'utf8'));
+    assert.equal(manifest.venue, 'club');
+    assert.deepEqual(manifest.loops, {
+        bored: 'bored.mp4', neutral: 'neutral.mp4',
+        engaged: 'engaged.mp4', ecstatic: 'ecstatic.mp4',
+    });
+    assert.deepEqual(manifest.stingers, { clap: 'clap.mp4', cheer: 'cheer.mp4' });
+    assert.deepEqual(manifest.sfx, { up: 'sfx-up.mp3', down: 'sfx-down.mp3' });
+    assert.equal(manifest.intro.video, 'intro.mp4');
+    assert.equal(manifest.intro.audio, 'club-ambience.mp3');
+    for (const f of [
+        ...Object.values(manifest.loops),
+        ...Object.values(manifest.stingers),
+        manifest.intro.video,
+        manifest.intro.audio,
+        manifest.sfx.up,
+        manifest.sfx.down,
+    ]) {
+        const stat = fs.statSync(path.join(packDir, f));
+        assert.ok(stat.size > 0, `${f} must be present`);
+    }
+});
+
 test('shell promotes the career plugin into the sidebar', () => {
     const src = fs.readFileSync(SHELL_JS, 'utf8');
     assert.match(src, /key: 'career',\s*screen: 'plugin-career'/);

tests/js/highway_pause_throttle.test.js

@@ -77,3 +77,50 @@ test('throttle runs after the ready gate, before bundle/draw', () => {
     assert.ok(readyIdx < throttleIdx, 'throttle must come after the ready gate');
     assert.ok(throttleIdx < drawIdx, 'throttle must come before the renderer draw');
 });
+
+// ── The throttle must not starve a renderer that animates on its own clock ──
+//
+// The throttle assumes a paused chart is a still picture, so re-rendering it is
+// waste. That stopped being true when the venue landed: the 3D highway draws the
+// venue's VIDEO backdrop and its reactive crowd into the same canvas as the
+// notes, so capping paused frames capped the whole room — pausing the song
+// dropped the venue to ~10 fps ("everything around the highway drops fps").
+//
+// Renderers now opt out via an optional needsContinuousFrames(). Absent or
+// throwing must mean false, so every other renderer keeps the throttle.
+
+test('paused throttle defers to a renderer that needs continuous frames', () => {
+    const src = highwaySources();
+    const fn = extractBlock(src, 'function draw()');
+    assert.match(fn, /_rendererNeedsContinuousFrames\s*\(\s*\)/,
+        'the paused throttle must consult the renderer capability');
+    // The capability must GATE the early-return, not merely be called near it:
+    // the throttle only applies when the renderer does NOT need every frame.
+    assert.match(
+        fn,
+        /!\s*_rendererNeedsContinuousFrames\s*\(\s*\)[\s\S]{0,160}_PAUSED_FRAME_INTERVAL_MS[\s\S]{0,40}return;/,
+        'throttle must be skipped when the renderer needs continuous frames',
+    );
+});
+
+test('the capability probe fails closed (absent / non-function / throwing)', () => {
+    const src = highwaySources();
+    const fn = extractBlock(src, 'function _rendererNeedsContinuousFrames()');
+    assert.match(fn, /typeof\s+r\.needsContinuousFrames\s*!==\s*'function'[\s\S]{0,40}return false/,
+        'a renderer without the method must keep the throttle');
+    assert.match(fn, /catch[\s\S]{0,40}return false/,
+        'a throwing renderer must keep the throttle, not crash the draw loop');
+    assert.match(fn, /===\s*true/,
+        'only an explicit true opts out — a truthy accident must not disable the throttle');
+});
+
+test('3D highway claims continuous frames only while a crowd video is rolling', () => {
+    const h3d = fs.readFileSync(
+        path.join(__dirname, '..', '..', 'plugins', 'highway_3d', 'screen.js'), 'utf8');
+    const fn = extractBlock(h3d, 'needsContinuousFrames()');
+    assert.match(fn, /_venueCrowdVideos/, 'must key off the actual crowd video elements');
+    assert.match(fn, /\.paused/, 'a paused video is a still frame — throttle should still apply');
+    // With no venue pack (the common case) the paused scene really is static and
+    // the GPU saving must survive: the method has to be able to return false.
+    assert.match(fn, /return false;/, 'must fall through to false with no live video');
+});

tests/js/venue_crowd.test.js

@@ -128,3 +128,22 @@ test('venue-scene-3d activates/deactivates the crowd layer', () => {
     assert.match(src, /syncCrowd\(false\)/);
     assert.match(src, /v3VenueCrowd/);
 });
+
+test('machine.force commits instantly and dwell holds the forced state', () => {
+    const m = crowd.createCrowdMachine();
+    m.force('ecstatic', 100000);
+    assert.equal(m.current, 'ecstatic');
+    // The real perf state cannot reassert until the dwell window passes.
+    m.update('smoke', 100000 + crowd.STABLE_MS);
+    assert.equal(m.update('smoke', 100000 + crowd.DWELL_MS - 1), null);
+    assert.equal(m.current, 'ecstatic');
+    assert.equal(m.update('smoke', 100000 + crowd.DWELL_MS), 'bored');
+    // Bogus states are ignored.
+    m.force('confused', 200000);
+    assert.equal(m.current, 'bored');
+});
+
+test('celebrate() is exported and no-ops without a manifest/active venue', () => {
+    assert.equal(typeof crowd.celebrate, 'function');
+    assert.equal(crowd.celebrate(), false);
+});

tests/js/venue_scene_3d.test.js

@@ -208,7 +208,7 @@ test('index.html loads venue deps before venue-scene-3d', () => {
     assert.ok(vizIdx < moodIdx && moodIdx < sceneIdx);
 });
 
-test('syncViz activates only for venue visualization id', () => {
+test('syncViz activates only for venue visualization id, and only on the player', () => {
     global.h3dVenueSceneSetActive = (on) => { global._h3dActive = on; };
     global.h3dVenueSceneSetMood = (s) => { global._h3dMood = s; };
     global.h3dVenueSceneSetInstrumentPov = () => {};
@@ -216,7 +216,14 @@ test('syncViz activates only for venue visualization id', () => {
     global.v3VenueViz = venueViz;
     global.v3VenueInstrumentPov = pov;
     global.feedBack = { on() {} };
+    // The venue is scoped to the song player: selecting Venue is a preference
+    // for THAT screen, not a licence to paint the venue over anything else that
+    // borrows the highway_3d renderer (Virtuoso's practice charts did exactly
+    // that). syncViz therefore needs to know which screen is showing.
+    const onScreen = (id) => { global.document = { querySelector: (s) => (s === '.screen.active' && id ? { id } : null) }; };
+    const prevDoc = global.document;
     try {
+        onScreen('player');
         venueScene.deactivate();
         venueScene.syncViz('highway_3d');
         assert.equal(global._h3dActive, false);
@@ -224,7 +231,16 @@ test('syncViz activates only for venue visualization id', () => {
         assert.equal(global._h3dActive, true);
         assert.equal(venueScene.getState().active, true);
         assert.equal(venueScene.getState().themeId, 'small-club');
+
+        // ...and the same call OFF the player must not activate it.
+        venueScene.deactivate();
+        onScreen('virtuoso');
+        venueScene.syncViz('venue');
+        assert.equal(global._h3dActive, false,
+            'Venue selected must NOT paint the venue onto the Virtuoso highway');
+        assert.equal(venueScene.getState().active, false);
     } finally {
+        global.document = prevDoc;
         venueScene.deactivate();
         delete global.h3dVenueSceneSetActive;
         delete global.h3dVenueSceneSetMood;

tests/js/venue_scope.test.js

@@ -0,0 +1,119 @@
+// Two venue bugs reported from a live career session.
+//
+// 1. Changing arrangement mid-song replayed the venue arrival flyover. The
+//    camera flew in from the back of the room again, every time the player
+//    switched lead -> rhythm. changeArrangement() reloads the song through the
+//    normal load path, so highway.js re-emits `song:loaded` — same filename,
+//    new arrangement — and the venue could not tell that from a fresh arrival.
+//    The player is already on stage; the room should just carry on.
+//
+// 2. With Venue selected, the venue backdrop showed up on the VIRTUOSO highway.
+//    The venue was gated purely on the viz selection, which is a global
+//    preference and says nothing about what is on screen. Virtuoso borrows the
+//    same highway_3d renderer for its practice charts, so it inherited the
+//    crowd and the stage behind a chromatic exercise. The venue belongs to the
+//    song player and nowhere else.
+
+'use strict';
+
+const { test } = require('node:test');
+const assert = require('node:assert/strict');
+
+const crowd = require('../../static/v3/venue-crowd.js');
+
+// ── 1. arrangement switch is not an arrival ────────────────────────────────
+
+test('same filename = arrangement switch (no arrival flyover)', () => {
+    // changeArrangement() re-emits song:loaded for the song already on stage.
+    assert.equal(crowd.isArrangementSwitch('song.feedpak', 'song.feedpak'), true);
+});
+
+test('different filename = a genuinely new song (flyover is correct)', () => {
+    assert.equal(crowd.isArrangementSwitch('a.feedpak', 'b.feedpak'), false);
+});
+
+test('first load of the session is an arrival, not a switch', () => {
+    // No previous song -> the flyover must play.
+    assert.equal(crowd.isArrangementSwitch('', 'a.feedpak'), false);
+});
+
+test('a missing filename is never treated as a switch', () => {
+    // Otherwise a malformed payload would silently suppress the flyover for the
+    // rest of the session.
+    assert.equal(crowd.isArrangementSwitch('a.feedpak', ''), false);
+    assert.equal(crowd.isArrangementSwitch('a.feedpak', undefined), false);
+    assert.equal(crowd.isArrangementSwitch('', ''), false);
+});
+
+// ── 2. the venue belongs to the player screen ──────────────────────────────
+
+const scene = require('../../static/v3/venue-scene-3d.js');
+
+// Venue MUST be the selected visualization for these to mean anything: if the
+// viz were unset, shouldBeActive() would be false for the wrong reason and the
+// virtuoso assertion below would pass vacuously. Force the viz on, so the only
+// thing under test is the SCREEN gate.
+function withScreen(id, fn) {
+    const prevDoc = global.document;
+    const prevViz = global.v3VenueViz;
+    global.v3VenueViz = {
+        isVenueVisualization: (v) => String(v) === 'venue',
+        getSelectedVizId: () => 'venue',
+    };
+    global.document = {
+        querySelector(sel) {
+            if (sel !== '.screen.active') return null;
+            return id ? { id } : null;
+        },
+    };
+    try { return fn(); } finally { global.document = prevDoc; global.v3VenueViz = prevViz; }
+}
+
+test('guard: with Venue selected AND on the player, the venue IS active', () => {
+    // If this ever fails, every "not active" test below is vacuous.
+    withScreen('player', () => {
+        assert.equal(scene.shouldBeActive(), true,
+            'the screen gate must not break the normal case');
+    });
+});
+
+test('venue is active on the player screen', () => {
+    withScreen('player', () => {
+        assert.equal(scene.isPlayerScreen(), true);
+    });
+});
+
+test('venue is NOT active on the virtuoso screen (the bug)', () => {
+    withScreen('virtuoso', () => {
+        assert.equal(scene.isPlayerScreen(), false,
+            'Virtuoso borrows the same highway_3d renderer — the venue backdrop ' +
+            'must not follow it there');
+        assert.equal(scene.shouldBeActive(), false,
+            'selecting Venue is a preference for the PLAYER; it is not a licence ' +
+            'to paint the venue over whatever else is using the renderer');
+    });
+});
+
+test('venue is not active on any other screen either', () => {
+    for (const id of ['v3-home', 'plugin-folder_library', 'settings', 'career']) {
+        withScreen(id, () => {
+            assert.equal(scene.shouldBeActive(), false, `venue must not be active on ${id}`);
+        });
+    }
+});
+
+test('no active screen at all is not the player', () => {
+    withScreen(null, () => {
+        assert.equal(scene.isPlayerScreen(), false);
+    });
+});
+
+test('a throwing document does not take the venue down with it', () => {
+    const prev = global.document;
+    global.document = { querySelector() { throw new Error('detached'); } };
+    try {
+        assert.equal(scene.isPlayerScreen(), false, 'must fail closed, not throw');
+    } finally {
+        global.document = prev;
+    }
+});

tests/plugins/career/conftest.py

@@ -26,7 +26,8 @@ class FakeMetaDb:
         self.conn.execute(
             """CREATE TABLE song_stats (
                    filename TEXT, arrangement TEXT, best_accuracy REAL,
-                   last_played_at TEXT
+                   last_accuracy REAL, last_played_at TEXT,
+                   seconds_total REAL NOT NULL DEFAULT 0
                )"""
         )
         self.conn.execute(
@@ -37,9 +38,12 @@ class FakeMetaDb:
         )
 
     def add(self, filename, arrangement, best_accuracy, in_library=True,
-            genre="", arrangements=None, last_played_at=None):
-        self.conn.execute("INSERT INTO song_stats VALUES (?, ?, ?, ?)",
-                          (filename, arrangement, best_accuracy, last_played_at))
+            genre="", arrangements=None, last_played_at=None, seconds_total=0,
+            last_accuracy=None):
+        self.conn.execute("INSERT INTO song_stats VALUES (?, ?, ?, ?, ?, ?)",
+                          (filename, arrangement, best_accuracy,
+                           last_accuracy if last_accuracy is not None else best_accuracy,
+                           last_played_at, seconds_total))
         if in_library:
             self.conn.execute(
                 "INSERT INTO songs SELECT ?, ?, ?, ?, ? WHERE NOT EXISTS "

tests/plugins/career/test_passports.py

@@ -27,13 +27,47 @@ def _passport(client, instrument="guitar", genre_key="blues"):
 
 
 def test_badge_earned_at_five_genre_songs_two_stars(client, meta_db):
+    # Soul has no curated drill requirement — songs alone mint the badge.
+    for i in range(5):
+        meta_db.add(f"soul{i}.feedpak", 0, 0.8, genre="Soul", arrangements=LEAD)
+    _open(client, "guitar", "Soul")
+    p = _passport(client, "guitar", "soul")
+    assert p["badge"] == "earned"
+    assert p["qualifying_count"] == 5
+    assert all(s["qualifies"] and s["stars"] == 2 for s in p["songs"])
+
+
+def test_shipped_blues_drill_gates_and_keys_cleared_clears_it(client, meta_db):
+    # Blues ships a guitar drill (blues_shuffle): songs alone are not enough.
     for i in range(5):
         meta_db.add(f"blues{i}.feedpak", 0, 0.8, genre="Blues", arrangements=LEAD)
     _open(client)
     p = _passport(client)
+    assert p["badge"] == "in_progress"
+    assert p["drills"]["required"] == ["blues_shuffle"]
+    # One key cleared (a top-tier clean pass) counts as cleared — the depth
+    # rungs are a higher bar than Bronze needs.
+    res = client.post("/api/plugins/career/drill-state", json={
+        "mode": "casual", "xp": 10,
+        "byNode": {"blues_shuffle": {"reps": 12, "keysCleared": ["E"],
+                                     "depth": {"travel": None, "clean": None},
+                                     "masteredAt": None}}})
+    assert res.status_code == 200
+    p = _passport(client)
+    assert p["drills"]["cleared"] == ["blues_shuffle"]
+    assert p["badge"] == "earned"
+
+
+def test_drill_lists_are_per_instrument(client, meta_db):
+    # Keys is graded but Blues curates only a GUITAR drill — a keys passport
+    # earns on songs alone.
+    keys_arr = [{"type": "lead", "name": "Keys"}]
+    for i in range(5):
+        meta_db.add(f"kb{i}.feedpak", 0, 0.9, genre="Blues", arrangements=keys_arr)
+    _open(client, "keys")
+    p = _passport(client, "keys")
+    assert p["drills"]["required"] == []
     assert p["badge"] == "earned"
-    assert p["qualifying_count"] == 5
-    assert all(s["qualifies"] and s["stars"] == 2 for s in p["songs"])
 
 
 def test_badge_in_progress_below_the_bar(client, meta_db):
@@ -143,3 +177,271 @@ def test_drill_state_validation(client):
     huge = {"byNode": {"pad": "x" * (300 * 1024)}}
     assert client.post("/api/plugins/career/drill-state",
                        json=huge).status_code == 413
+
+
+def test_hours_odometer_sums_seconds_per_instrument_and_genre(client, meta_db):
+    both = [{"type": "lead", "name": "Lead"}, {"type": "bass", "name": "Bass"}]
+    # Two lead arrangements' time sums; the bass row stays on the bass passport.
+    meta_db.add("a.feedpak", 0, 0.8, genre="Blues", arrangements=both, seconds_total=600)
+    meta_db.add("b.feedpak", 0, 0.8, genre="Blues", arrangements=both, seconds_total=300)
+    meta_db.add("b.feedpak", 1, 0.9, genre="Blues", arrangements=both, seconds_total=1200)
+    _open(client, "guitar")
+    _open(client, "bass")
+    assert _passport(client, "guitar")["seconds_total"] == 900
+    assert _passport(client, "bass")["seconds_total"] == 1200
+
+
+def test_drill_state_merge_is_gained_only(client, meta_db):
+    # A cleared drill survives a later STALE snapshot that lacks it
+    # (multi-browser race / settings import / the boot relay).
+    for i in range(5):
+        meta_db.add(f"blues{i}.feedpak", 0, 0.8, genre="Blues", arrangements=LEAD)
+    _open(client)
+    client.post("/api/plugins/career/drill-state", json={
+        "byNode": {"blues_shuffle": {"keysCleared": ["E"]}}})
+    assert _passport(client)["badge"] == "earned"
+    # Stale relay: empty byNode, then one with the node but nothing earned.
+    client.post("/api/plugins/career/drill-state", json={"byNode": {}})
+    client.post("/api/plugins/career/drill-state", json={
+        "byNode": {"blues_shuffle": {"reps": 2, "keysCleared": [],
+                                     "depth": {"travel": None}, "masteredAt": None}}})
+    p = _passport(client)
+    assert p["drills"]["cleared"] == ["blues_shuffle"]
+    assert p["badge"] == "earned"
+
+
+def test_genre_families_inherit_drills(client, meta_db):
+    # 'death metal' has no exact entry — it inherits the metal family's drill.
+    for i in range(5):
+        meta_db.add(f"dm{i}.feedpak", 0, 0.9, genre="Death Metal", arrangements=LEAD)
+    _open(client, "guitar", "Death Metal")
+    p = _passport(client, "guitar", "death metal")
+    assert p["drills"]["required"] == ["melodic_metal_gallop"]
+    assert p["badge"] == "in_progress"
+    # 'metalcore' (single word) matches by substring, no alias needed.
+    _open(client, "guitar", "Metalcore")
+    assert _passport(client, "guitar", "metalcore")["drills"]["required"] == \
+        ["melodic_metal_gallop"]
+    # 'blues rock' resolves by family LIST ORDER: blues comes before rock.
+    _open(client, "guitar", "Blues Rock")
+    assert _passport(client, "guitar", "blues rock")["drills"]["required"] == \
+        ["blues_shuffle"]
+    # A genre outside every family stays songs-only.
+    _open(client, "guitar", "Reggae")
+    assert _passport(client, "guitar", "reggae")["drills"]["required"] == []
+    # Exact per-genre entries still beat the family (the shipped 'metal' entry
+    # IS the exact entry for genre key 'metal').
+    _open(client, "guitar", "Metal")
+    assert _passport(client, "guitar", "metal")["drills"]["required"] == \
+        ["melodic_metal_gallop"]
+
+
+def test_family_drills_stay_per_instrument(client, meta_db):
+    # Family inheritance must not leak guitar drills onto other instruments.
+    keys_arr = [{"type": "lead", "name": "Keys"}]
+    for i in range(5):
+        meta_db.add(f"kdm{i}.feedpak", 0, 0.9, genre="Death Metal", arrangements=keys_arr)
+    _open(client, "keys", "Death Metal")
+    p = _passport(client, "keys", "death metal")
+    assert p["drills"]["required"] == []
+    assert p["badge"] == "earned"
+
+
+def test_nearest_invitations_order_and_exclusions(client, meta_db):
+    # Non-qualifying songs sorted by distance to the QUALIFYING bar;
+    # qualifying songs never appear; capped at 3.
+    meta_db.add("q.feedpak", 0, 0.80, genre="Soul", arrangements=LEAD)      # qualifies
+    meta_db.add("close.feedpak", 0, 0.74, genre="Soul", arrangements=LEAD)  # 1% to 2★
+    meta_db.add("mid.feedpak", 0, 0.70, genre="Soul", arrangements=LEAD)    # 5% to 2★
+    meta_db.add("far.feedpak", 0, 0.30, genre="Soul", arrangements=LEAD)    # 30% to 1★
+    meta_db.add("far2.feedpak", 0, 0.25, genre="Soul", arrangements=LEAD)
+    _open(client, "guitar", "Soul")
+    p = _passport(client, "guitar", "soul")
+    names = [s["filename"] for s in p["nearest"]]
+    assert names == ["close.feedpak", "mid.feedpak", "far.feedpak"]
+    assert all(s["next_star_at"] is not None for s in p["nearest"])
+    assert "q.feedpak" not in names
+
+
+def test_nearest_targets_the_qualifying_bar_not_next_star(client, meta_db):
+    # A 0★ song 1% from its NEXT star is farther from the ★★ badge bar than
+    # a 1★ song 5% from it — nearest must rank by the badge bar.
+    meta_db.add("one_star.feedpak", 0, 0.70, genre="Soul", arrangements=LEAD)   # 5% to bar
+    meta_db.add("zero_star.feedpak", 0, 0.59, genre="Soul", arrangements=LEAD)  # 1% to next ★, 16% to bar
+    _open(client, "guitar", "Soul")
+    p = _passport(client, "guitar", "soul")
+    assert [s["filename"] for s in p["nearest"]] == ["one_star.feedpak", "zero_star.feedpak"]
+    assert all(s["bar_at"] == 0.75 for s in p["nearest"])
+# ── Gigs ──────────────────────────────────────────────────────────────────────
+
+def test_gig_propose_mixes_owned_and_stakes(client, meta_db):
+    for i in range(4):
+        meta_db.add(f"own{i}.feedpak", 0, 0.85, genre="Soul", arrangements=LEAD)
+    meta_db.add("stake.feedpak", 0, 0.70, genre="Soul", arrangements=LEAD)
+    meta_db.add_song_only("fresh.feedpak", genre="Soul")
+    res = client.post("/api/plugins/career/gigs/propose",
+                      json={"instrument": "guitar", "genre": "Soul", "size": 4})
+    assert res.status_code == 200
+    gig = res.json()
+    files = [s["filename"] for s in gig["songs"]]
+    assert len(files) == 4
+    assert "stake.feedpak" in files          # a near-bar song gives the set stakes
+    assert gig["venue_id"] == "bar"          # 9 stars < 50: the dive bar
+
+    # A young passport (nothing played) still gets a playable set from the
+    # library's unplayed genre songs.
+    res2 = client.post("/api/plugins/career/gigs/propose",
+                       json={"instrument": "guitar", "genre": "Ska"})
+    assert res2.status_code == 404           # no ska in the library at all
+    meta_db.add_song_only("ska1.feedpak", genre="Ska")
+    res3 = client.post("/api/plugins/career/gigs/propose",
+                       json={"instrument": "guitar", "genre": "Ska"})
+    assert [s["filename"] for s in res3.json()["songs"]] == ["ska1.feedpak"]
+
+
+def test_gig_log_computes_encore_and_surfaces_in_passports(client, meta_db):
+    for i in range(2):
+        meta_db.add(f"s{i}.feedpak", 0, 0.9, genre="Soul", arrangements=LEAD,
+                    last_accuracy=0.9)
+    _open(client, "guitar", "Soul")
+    res = client.post("/api/plugins/career/gigs", json={
+        "instrument": "guitar", "genre": "Soul", "venue_id": "bar",
+        "songs": ["s0.feedpak", "s1.feedpak"]})
+    assert res.status_code == 200
+    gig = res.json()["gig"]
+    assert gig["encore"] is True             # avg 0.9 ≥ 0.75
+    assert gig["songs"][0]["accuracy"] == 0.9
+    view = client.get("/api/plugins/career/passports").json()
+    assert view["instruments"]["guitar"]["gig_count"] == 1
+    p = _passport(client, "guitar", "soul")
+    assert len(p["gigs"]) == 1 and p["gigs"][0]["encore"] is True
+
+
+def test_gig_log_validation_and_no_fail_state(client):
+    # Unknown venue / bad songs shapes are rejected; nothing is ever logged
+    # as a failed gig — the endpoint only appends completed sets.
+    assert client.post("/api/plugins/career/gigs", json={
+        "instrument": "guitar", "genre": "Soul", "venue_id": "nope",
+        "songs": ["x"]}).status_code == 400
+    assert client.post("/api/plugins/career/gigs", json={
+        "instrument": "guitar", "genre": "Soul", "songs": []}).status_code == 400
+    assert client.post("/api/plugins/career/gigs", json={
+        "instrument": "guitar", "genre": "Soul",
+        "songs": ["f"] * 9}).status_code == 400
+
+
+def test_gig_accuracy_reads_newest_row_and_encore_needs_full_set(client, meta_db):
+    # Newest row wins: a stale higher accuracy on another arrangement must
+    # not inflate the gig log.
+    meta_db.add("dual.feedpak", 1, 0.95, genre="Soul", arrangements=BASS,
+                last_accuracy=0.95, last_played_at="2026-06-01T00:00:00")
+    meta_db.add("dual.feedpak", 0, 0.60, genre="Soul", arrangements=LEAD,
+                last_accuracy=0.60, last_played_at="2026-07-14T00:00:00")
+    res = client.post("/api/plugins/career/gigs", json={
+        "instrument": "guitar", "genre": "Soul", "songs": ["dual.feedpak"]})
+    assert res.json()["gig"]["songs"][0]["accuracy"] == 0.6
+
+    # A set with an unscored song never earns the encore off one good song.
+    meta_db.add("scored.feedpak", 0, 0.9, genre="Soul", arrangements=LEAD,
+                last_accuracy=0.9, last_played_at="2026-07-14T00:01:00")
+    res2 = client.post("/api/plugins/career/gigs", json={
+        "instrument": "guitar", "genre": "Soul",
+        "songs": ["scored.feedpak", "ghost.feedpak"]})
+    assert res2.json()["gig"]["encore"] is False
+
+
+def test_gig_propose_backfills_from_surplus_qualifying(client, meta_db):
+    # Mature passport: plenty of qualifying songs, nothing near the bar,
+    # nothing unplayed — the set still fills to size.
+    for i in range(8):
+        meta_db.add(f"own{i}.feedpak", 0, 0.9, genre="Ska", arrangements=LEAD)
+    res = client.post("/api/plugins/career/gigs/propose",
+                      json={"instrument": "guitar", "genre": "Ska", "size": 5})
+    assert len(res.json()["songs"]) == 5
+
+
+def test_gig_propose_backfill_offset_survives_stakes(client, meta_db):
+    # 4 qualifying + 1 near-bar stake, size 5: the stake must not shift the
+    # qualifying backfill window past eligible songs.
+    for i in range(4):
+        meta_db.add(f"q{i}.feedpak", 0, 0.9, genre="Reggae", arrangements=LEAD)
+    meta_db.add("near.feedpak", 0, 0.7, genre="Reggae", arrangements=LEAD)
+    res = client.post("/api/plugins/career/gigs/propose",
+                      json={"instrument": "guitar", "genre": "Reggae", "size": 5})
+    files = [s["filename"] for s in res.json()["songs"]]
+    assert len(files) == 5 and len(set(files)) == 5
+    assert "near.feedpak" in files
+
+
+# ── Gold rung ─────────────────────────────────────────────────────────────────
+
+def test_gold_upgrades_bronze_via_family_style_artifact(client, meta_db):
+    # Bronze earned on 'death metal' (family: metal); a metal gold artifact
+    # from the jam verifier upgrades it — bronze-only stays 'earned' elsewhere.
+    for i in range(5):
+        meta_db.add(f"dm{i}.feedpak", 0, 0.9, genre="Death Metal", arrangements=LEAD)
+    career_routes._state["passports_content"]["genres"]["metal"] = {}  # no drill gate for this test
+    _open(client, "guitar", "Death Metal")
+    client.post("/api/plugins/career/drill-state", json={"byNode": {}})
+    assert _passport(client, "guitar", "death metal")["badge"] == "earned"
+    client.post("/api/plugins/career/drill-state", json={
+        "byNode": {}, "goldImprov": {"metal": {"at": 1, "verifier": "comb", "inKeyPct": 0.9}}})
+    assert _passport(client, "guitar", "death metal")["badge"] == "gold"
+
+
+def test_gold_without_bronze_stays_in_progress(client, meta_db):
+    meta_db.add("one.feedpak", 0, 0.9, genre="Soul", arrangements=LEAD)
+    _open(client, "guitar", "Soul")
+    client.post("/api/plugins/career/drill-state", json={
+        "byNode": {}, "goldImprov": {"soul": {"at": 1, "verifier": "comb"}}})
+    assert _passport(client, "guitar", "soul")["badge"] == "in_progress"
+
+
+def test_gold_merge_is_gained_only(client, meta_db):
+    for i in range(5):
+        meta_db.add(f"s{i}.feedpak", 0, 0.9, genre="Soul", arrangements=LEAD)
+    _open(client, "guitar", "Soul")
+    client.post("/api/plugins/career/drill-state", json={
+        "byNode": {}, "goldImprov": {"soul": {"at": 1, "verifier": "comb"}}})
+    assert _passport(client, "guitar", "soul")["badge"] == "gold"
+    # A stale relay without the artifact never un-mints.
+    client.post("/api/plugins/career/drill-state", json={"byNode": {}})
+    assert _passport(client, "guitar", "soul")["badge"] == "gold"
+    # And a different artifact for the same style never overwrites the first —
+    # asserted against the PERSISTED snapshot (the view doesn't expose
+    # artifact contents), so a last-write-wins regression can't stay green.
+    client.post("/api/plugins/career/drill-state", json={
+        "byNode": {}, "goldImprov": {"soul": {"at": 999, "verifier": "yin"}}})
+    _, _, gold = career_routes._drill_by_node()
+    assert gold["soul"] == {"at": 1, "verifier": "comb"}
+
+
+def test_gold_matches_raw_style_id_through_family(client, meta_db):
+    # Virtuoso mints under raw STYLE_PALETTES ids ('punk', not 'rock'): a
+    # 'punk rock' passport (family rock) must go gold from a 'punk' artifact.
+    for i in range(5):
+        meta_db.add(f"pk{i}.feedpak", 0, 0.9, genre="Punk Rock", arrangements=LEAD)
+    career_routes._state["passports_content"]["genres"]["rock"] = {}  # no drill gate
+    _open(client, "guitar", "Punk Rock")
+    client.post("/api/plugins/career/drill-state", json={
+        "byNode": {}, "goldImprov": {"punk": {"at": 1, "verifier": "comb"}}})
+    assert _passport(client, "guitar", "punk rock")["badge"] == "gold"
+
+
+def test_gold_intake_rejects_junk(client, meta_db):
+    # A non-dict goldImprov is a relay bug: loud 400, never a silent drop.
+    res = client.post("/api/plugins/career/drill-state",
+                      json={"byNode": {}, "goldImprov": ["metal"]})
+    assert res.status_code == 400
+    # Evidence-free artifacts (no verifier) never mint.
+    for i in range(5):
+        meta_db.add(f"j{i}.feedpak", 0, 0.9, genre="Soul", arrangements=LEAD)
+    _open(client, "guitar", "Soul")
+    client.post("/api/plugins/career/drill-state", json={
+        "byNode": {}, "goldImprov": {"soul": {}}})
+    assert _passport(client, "guitar", "soul")["badge"] == "earned"
+    # An oversized goldImprov is bounded BEFORE the merge, like byNode.
+    blob = {f"s{i}": {"verifier": "comb", "pad": "x" * 4096} for i in range(200)}
+    res = client.post("/api/plugins/career/drill-state",
+                      json={"byNode": {}, "goldImprov": blob})
+    assert res.status_code == 413

tests/plugins/career/test_routes.py

@@ -121,12 +121,17 @@ def test_pack_file_serving_and_traversal_guard(client):
 
 
 def test_state_reports_installed_and_delete_removes(client):
+    # All three venues now ship bundled, so deleting the downloaded copy
+    # falls back to the bundled pack: installed stays True by design
+    # (downloaded packs override bundled ones, never replace them).
     _install_fake_pack("club")
     state = client.get("/api/plugins/career/state").json()
     assert {v["id"]: v["installed"] for v in state["venues"]}["club"] is True
     assert client.delete("/api/plugins/career/packs/club").status_code == 200
     state = client.get("/api/plugins/career/state").json()
-    assert {v["id"]: v["installed"] for v in state["venues"]}["club"] is False
+    assert {v["id"]: v["installed"] for v in state["venues"]}["club"] is True
+    # the downloaded override itself is gone
+    assert not (career_routes._venue_dir("club") / "manifest.json").exists()
 
 
 def test_download_worker_end_to_end(client, tmp_path):

tests/test_field_overrides.py

@@ -273,3 +273,51 @@ def test_title_keyset_paging_is_complete_with_overrides(client, server):
         if not cursor:
             break
     assert sorted(seen) == ["a.archive", "b.archive", "c.archive"]   # each exactly once
+
+
+def test_enrichment_genre_fallback_precedence(client, server):
+    # Precedence: override → pack genre → MusicBrainz enrichment (matched only).
+    _put(server, "a.archive", title="A", genre="Rock")   # pack wins over enrichment
+    _put(server, "b.archive", title="B", genre="")       # falls back to enrichment
+    _put(server, "c.archive", title="C", genre="")       # override beats enrichment
+    _put(server, "d.archive", title="D", genre="")       # unmatched candidate: ignored
+    ins = "INSERT INTO song_enrichment (filename, match_state, genres) VALUES (?, ?, ?)"
+    server.meta_db.conn.execute(ins, ("a.archive", "matched", '["metal"]'))
+    server.meta_db.conn.execute(ins, ("b.archive", "matched", '["progressive rock", "rock"]'))
+    server.meta_db.conn.execute(ins, ("c.archive", "matched", '["jazz"]'))
+    server.meta_db.conn.execute(ins, ("d.archive", "review", '["country"]'))
+    _put(server, "e.archive", title="E", genre="")       # manual pin is trusted too
+    server.meta_db.conn.execute(ins, ("e.archive", "manual", '["ska"]'))
+    server.meta_db.conn.commit()
+    server.meta_db.set_song_override("c.archive", "genre", value="City Pop")
+
+    genres = client.get("/api/library/genres").json()["genres"]
+    assert "Rock" in genres                 # pack value kept for a
+    assert "metal" not in genres            # enrichment never overrides a pack genre
+    assert "progressive rock" in genres     # b: enrichment primary ([0]) surfaces
+    assert "City Pop" in genres and "jazz" not in genres   # override beats enrichment
+    assert "country" not in genres          # review/failed candidates never leak
+    assert "ska" in genres                  # user-pinned (manual) matches count
+
+    # Filtering by the enriched genre finds the song.
+    r = client.get("/api/library", params={"genre": "progressive rock"}).json()
+    assert [s["filename"] for s in r["songs"]] == ["b.archive"]
+
+
+def test_no_enrichment_and_no_overrides_uses_plain_column(server):
+    _put(server, "a.archive", title="A", genre="Rock")
+    assert server.meta_db._effective_genre_expr() == "genre"
+
+
+def test_overrides_without_enrichment_table_stay_safe(server):
+    # A stand-in scenario: overrides exist but song_enrichment is gone — the
+    # expression must not reference the missing table.
+    server.meta_db.conn.execute("DROP TABLE song_enrichment")
+    _put(server, "a.archive", title="A", genre="")
+    server.meta_db.set_song_override("a.archive", "genre", value="City Pop")
+    expr = server.meta_db._effective_genre_expr()
+    assert "song_enrichment" not in expr
+    # And it still evaluates: the override surfaces through the facet query.
+    row = server.meta_db.conn.execute(
+        f"SELECT {expr} FROM songs WHERE filename = 'a.archive'").fetchone()
+    assert row[0] == "City Pop"

tests/test_lyrics_transcribe_remote.py

@@ -0,0 +1,201 @@
+"""The remote transcription REQUEST — the thing that was never tested and never worked.
+
+`transcribe_vocals_remote()` POSTed the vocal stem to `/align`. That endpoint is *forced
+alignment*: "here are the lyrics, tell me when each word is sung". Its `text` field is required,
+and we have no lyrics — transcribing them is the entire point. So the server rejected every
+request with a 422 from FastAPI's validation layer, before its handler ever ran, and remote
+transcription had never worked for anybody (feedBack-plugin-stem-splitter#17).
+
+Nothing caught it because every test of this module tested the *mapper* — `_whisperx_to_sloppak`,
+fed a hand-written dict. The mapper was always fine. The request was never exercised, and the
+request was the bug.
+
+So these tests assert the request: which endpoint, and how `language` is carried. Both are
+invisible to a mapper test, and both are wrong in ways that fail quietly rather than loudly.
+"""
+from pathlib import Path
+from unittest import mock
+
+import pytest
+
+from lyrics_transcribe import transcribe_vocals_remote
+
+_ALIGNED = {
+    "segments": [{
+        "start": 1.0, "end": 2.0, "text": "hello world",
+        "words": [
+            {"word": "hello", "start": 1.0, "end": 1.4, "score": 0.9},
+            {"word": "world", "start": 1.5, "end": 2.0, "score": 0.9},
+        ],
+    }]
+}
+
+
+class _Resp:
+    def __init__(self, status=200, payload=None, text=""):
+        self.status_code = status
+        self._payload = payload if payload is not None else _ALIGNED
+        self.text = text
+
+    def json(self):
+        return self._payload
+
+
+@pytest.fixture
+def vocals(tmp_path: Path) -> Path:
+    p = tmp_path / "vocals.ogg"
+    p.write_bytes(b"not really ogg, we never decode it here")
+    return p
+
+
+def _post_call(vocals: Path, resp: _Resp, **kw):
+    with mock.patch("requests.post", return_value=resp) as post:
+        out = transcribe_vocals_remote(vocals, "http://server:7865", **kw)
+    return post.call_args, out
+
+
+def test_it_posts_to_transcribe_not_align(vocals):
+    """THE regression. /align requires `text`; we have none, so it 422s every time."""
+    call, out = _post_call(vocals, _Resp())
+
+    url = call.args[0]
+    assert url.endswith("/transcribe"), (
+        f"posted to {url!r} — /align is forced alignment and its `text` field is required, so "
+        f"this request is rejected with a 422 before the server's handler ever runs"
+    )
+    assert "/align" not in url
+    assert out, "a successful transcription must return syllables"
+
+
+def test_the_language_hint_is_a_form_field_not_a_query_param(vocals):
+    """The server reads `language` with Form(""). Sent as a query param it is silently ignored —
+    so an explicit hint does nothing, Whisper's auto-detection quietly decides instead, and the
+    wrong wav2vec2 aligner gets loaded. It "works", it's just wrong: the failure mode that hides
+    for months."""
+    call, _ = _post_call(vocals, _Resp(), language="es")
+
+    assert (call.kwargs.get("data") or {}).get("language") == "es", (
+        "the language hint must ride in the form body — the server reads Form('language'), and "
+        "a query param is dropped without a word"
+    )
+    assert "language" not in (call.kwargs.get("params") or {})
+
+
+def test_no_language_sends_no_hint(vocals):
+    # Absent is not the empty string: "" would pin detection to a language named "".
+    call, _ = _post_call(vocals, _Resp())
+    assert not (call.kwargs.get("data") or {})
+
+
+def test_the_file_is_sent_as_a_multipart_upload(vocals):
+    call, _ = _post_call(vocals, _Resp())
+    files = call.kwargs.get("files") or {}
+    assert "file" in files, "the server reads File('file')"
+    assert files["file"][0] == "vocals.ogg"
+
+
+def test_an_api_key_is_sent_as_a_bearer_token(vocals):
+    call, _ = _post_call(vocals, _Resp(), api_key="secret")
+    assert (call.kwargs.get("headers") or {})["Authorization"] == "Bearer secret"
+
+
+def test_an_instrumental_is_an_answer_not_a_crash(vocals):
+    # The server returns 200 + no segments for a stem with no singing in it. That is a valid
+    # answer ("this song has no vocals"), and it must not read as a failure.
+    _, out = _post_call(vocals, _Resp(payload={"segments": [], "language": "en"}))
+    assert out == []
+
+
+def test_a_server_error_surfaces_the_whole_body(vocals):
+    """The error body IS the diagnosis. A 422's JSON names the field it rejected; a 500's
+    traceback answers on its last line. The old 300-char cap decapitated both — which is how
+    this bug stayed invisible: the message explaining it was inside the part that got cut."""
+    tb = "Traceback (most recent call last):\n" + ("  File x, line 1\n" * 40) + \
+         "RuntimeError: CUDA out of memory"
+    assert len(tb) > 300 and "CUDA out of memory" not in tb[:300]
+
+    with pytest.raises(RuntimeError) as exc:
+        _post_call(vocals, _Resp(status=500, text=tb))
+    assert "CUDA out of memory" in str(exc.value)
+
+
+def test_truncation_keeps_the_exception_line_not_just_the_header():
+    """A traceback's ANSWER is its last line. Head-only truncation throws it away.
+
+    This is the same mistake as the 300-char cap, one level up: cutting off precisely the part
+    the function exists to preserve. A 4000-char window that contains "Traceback (most recent
+    call last)" and none of the exception is a window onto nothing."""
+    from lyrics_transcribe import _MAX_ERR_BODY, _err_body
+
+    frames = "".join(f'  File "/app/server.py", line {i}, in run\n    step()\n'
+                     for i in range(2000))          # far over the cap on its own
+    tb = "Traceback (most recent call last):\n" + frames + \
+         "RuntimeError: CUDA out of memory. Tried to allocate 2.20 GiB"
+
+    body = _err_body(_Resp(text=tb))
+    assert len(body) <= _MAX_ERR_BODY
+    assert "CUDA out of memory" in body, (
+        "the exception line is the diagnosis — a truncation that drops it keeps the part that "
+        "says work was happening and discards the part that says what went wrong"
+    )
+    assert "Traceback (most recent call last)" in body, "the head is context worth keeping too"
+    assert "truncated" in body
+
+
+def test_the_cap_is_a_bound_not_a_suggestion():
+    """The truncation marker must fit INSIDE _MAX_ERR_BODY, not be appended past it.
+
+    Otherwise the cap is advisory, and the callers who trust it — a log line, a job record
+    persisted to disk and re-read on every load — are the ones that get surprised."""
+    from lyrics_transcribe import _MAX_ERR_BODY, _err_body
+
+    body = _err_body(_Resp(text="x" * 500_000))
+    assert len(body) <= _MAX_ERR_BODY, (
+        f"body is {len(body)} chars, over the {_MAX_ERR_BODY} cap it claims to enforce"
+    )
+    assert "truncated" in body and "500000" in body
+
+
+def test_trailing_whitespace_is_not_content():
+    # A 300-char JSON body followed by 3900 blanks is not a long body, and cutting real content
+    # to make room for whitespace would be a silly way to lose the diagnosis.
+    from lyrics_transcribe import _err_body
+
+    payload = '{"detail":"nope"}'
+    assert _err_body(_Resp(text=payload + " " * 8000)) == payload
+
+
+def test_a_404_explains_that_the_server_is_too_old(vocals):
+    """A bare "404" sends someone hunting for a typo in their URL. The real answer is that their
+    server predates the endpoint, and only we can know that."""
+    with pytest.raises(RuntimeError) as exc:
+        _post_call(vocals, _Resp(status=404, text='{"detail":"Not Found"}'))
+    msg = str(exc.value)
+    assert "404" in msg
+    assert "/transcribe" in msg
+    assert "predates" in msg or "Update the server" in msg
+
+
+class TestEverythingFailsAsRuntimeError:
+    """The docstring promises one failure mode: RuntimeError. The caller
+    (`_maybe_transcribe_lyrics`) catches exactly that so one song's failed lyrics don't take down
+    the batch around it. A transport error escaping as requests.RequestException walks straight
+    past that handler — turning "this song's lyrics failed" into "the whole batch died"."""
+
+    def test_a_connection_failure(self, vocals):
+        import requests
+        with mock.patch("requests.post",
+                        side_effect=requests.ConnectionError("name resolution failed")):
+            with pytest.raises(RuntimeError, match="could not reach"):
+                transcribe_vocals_remote(vocals, "http://nope:7865")
+
+    def test_a_timeout(self, vocals):
+        import requests
+        with mock.patch("requests.post", side_effect=requests.Timeout("timed out")):
+            with pytest.raises(RuntimeError, match="could not reach"):
+                transcribe_vocals_remote(vocals, "http://server:7865")
+
+    def test_an_unreadable_stem(self, tmp_path):
+        missing = tmp_path / "gone.ogg"      # never created
+        with pytest.raises(RuntimeError, match="could not read"):
+            transcribe_vocals_remote(missing, "http://server:7865")

tests/test_migrate_full_mix_stem.py

@@ -0,0 +1,429 @@
+"""tools/migrate_full_mix_stem.py — packs off the deprecated `original_audio:` key.
+
+The migration moves real audio inside tens of thousands of archives, so the
+interesting cases are the ones where it must NOT act: a pack it would corrupt, a
+pack it has already done, a pack whose mixdown isn't where the key claims.
+"""
+
+from __future__ import annotations
+
+import importlib.util
+import zipfile
+from pathlib import Path
+
+import pytest
+import yaml
+
+_SPEC = importlib.util.spec_from_file_location(
+    "migrate_full_mix_stem",
+    Path(__file__).resolve().parent.parent / "tools" / "migrate_full_mix_stem.py",
+)
+mig = importlib.util.module_from_spec(_SPEC)
+_SPEC.loader.exec_module(mig)
+
+
+def _manifest(**extra) -> dict:
+    m = {
+        "feedpak_version": "1.13.0",
+        "title": "T",
+        "artist": "A",
+        "duration": 1.0,
+        "arrangements": [{"id": "lead", "file": "arrangements/lead.json"}],
+        "stems": [
+            {"id": "guitar", "file": "stems/guitar.ogg", "default": "on"},
+            {"id": "drums", "file": "stems/drums.ogg", "default": "on"},
+        ],
+        "original_audio": "original/full.ogg",
+    }
+    m.update(extra)
+    return m
+
+
+def _write_pack(path: Path, manifest: dict, files: dict[str, bytes] | None = None) -> Path:
+    files = files or {
+        "original/full.ogg": b"MIXDOWN",
+        "stems/guitar.ogg": b"g",
+        "stems/drums.ogg": b"d",
+        "arrangements/lead.json": b"{}",
+    }
+    with zipfile.ZipFile(path, "w", zipfile.ZIP_DEFLATED) as zf:
+        zf.writestr("manifest.yaml", yaml.safe_dump(manifest, sort_keys=False))
+        for name, data in files.items():
+            zf.writestr(name, data)
+    return path
+
+
+def _read(path: Path) -> tuple[dict, set[str]]:
+    with zipfile.ZipFile(path) as zf:
+        return yaml.safe_load(zf.read("manifest.yaml")), set(zf.namelist())
+
+
+# ── plan_manifest: the decisions, without the archives ──────────────────────
+
+def test_plan_adds_the_full_stem_and_drops_the_key():
+    new, move = mig.plan_manifest(_manifest())
+    assert move == "original/full.ogg"
+    assert "original_audio" not in new
+    assert new["stems"][0] == {
+        "id": "full",
+        "file": "stems/full.ogg",
+        "default": "off",
+    }
+    # The separated stems survive, in order, untouched.
+    assert [s["id"] for s in new["stems"]] == ["full", "guitar", "drums"]
+    assert new["feedpak_version"] == "1.15.0"
+
+
+def test_plan_marks_the_retained_mixdown_default_off():
+    """The one line that keeps a pre-1.15.0 reader from doubling the song: a
+    reader that sums every stem still won't play `full` on open if it honours
+    `default`, which has been normative since 1.0.0."""
+    new, _ = mig.plan_manifest(_manifest())
+    assert new["stems"][0]["default"] == "off"
+
+
+def test_plan_marks_a_sole_mixdown_default_on():
+    """With no separated stems the mixdown IS the audio — off would mute the pack."""
+    new, _ = mig.plan_manifest(_manifest(stems=[]))
+    assert new["stems"] == [{"id": "full", "file": "stems/full.ogg", "default": "on"}]
+
+
+def test_plan_preserves_unknown_keys_verbatim():
+    """Spec §3: a writer that re-emits a pack SHOULD preserve unknown keys."""
+    new, _ = mig.plan_manifest(_manifest(source_tool="ExampleTool v1.2.3", rigs="rigs.json"))
+    assert new["source_tool"] == "ExampleTool v1.2.3"
+    assert new["rigs"] == "rigs.json"
+
+
+def test_plan_skips_an_already_migrated_pack():
+    m = _manifest(
+        stems=[{"id": "full", "file": "stems/full.ogg", "default": "off"}],
+    )
+    del m["original_audio"]
+    with pytest.raises(mig.Skip):
+        mig.plan_manifest(m)
+
+
+def test_plan_skips_a_pack_that_never_had_the_key():
+    m = _manifest()
+    del m["original_audio"]
+    with pytest.raises(mig.Skip):
+        mig.plan_manifest(m)
+
+
+def test_plan_drops_a_stale_key_without_moving_anything():
+    """Mixdown already a stem, dead key lingering beside it."""
+    new, move = mig.plan_manifest(
+        _manifest(stems=[{"id": "full", "file": "stems/full.ogg", "default": "off"}])
+    )
+    assert move == ""
+    assert "original_audio" not in new
+    assert [s["id"] for s in new["stems"]] == ["full"]
+
+
+def test_plan_forces_an_existing_full_stem_off_beside_instrument_stems():
+    """Dropping the stale key is not enough if the mixdown it duplicated is left
+    ENABLED: a reader that honours `default` would then play the whole song on top
+    of the stems on open. The migration must not hand back a pack in the exact
+    state it exists to remove."""
+    new, move = mig.plan_manifest(
+        _manifest(
+            stems=[
+                {"id": "full", "file": "stems/full.ogg", "default": "on"},
+                {"id": "guitar", "file": "stems/guitar.ogg", "default": "on"},
+            ]
+        )
+    )
+    assert move == ""
+    assert new["stems"][0] == {"id": "full", "file": "stems/full.ogg", "default": "off"}
+    assert new["stems"][1]["default"] == "on"  # instruments untouched
+
+
+def test_plan_leaves_a_sole_full_stem_enabled_when_dropping_a_stale_key():
+    """No instruments beside it — the mixdown IS the audio. Forcing it off here
+    would mute the pack."""
+    new, _ = mig.plan_manifest(
+        _manifest(stems=[{"id": "full", "file": "stems/full.ogg", "default": "on"}])
+    )
+    assert new["stems"] == [{"id": "full", "file": "stems/full.ogg", "default": "on"}]
+
+
+def test_plan_needs_no_move_when_the_key_already_points_at_the_canonical_path():
+    new, move = mig.plan_manifest(_manifest(original_audio="stems/full.ogg"))
+    assert move == ""
+    assert new["stems"][0]["file"] == "stems/full.ogg"
+
+
+# ── migrate_zip: the archive rewrite ────────────────────────────────────────
+
+def test_migrate_moves_the_audio_and_rewrites_the_manifest(tmp_path: Path):
+    pak = _write_pack(tmp_path / "song.feedpak", _manifest())
+    assert mig.migrate_zip(pak, dry_run=False) == "migrated"
+
+    manifest, names = _read(pak)
+    assert "original/full.ogg" not in names       # the invented directory is gone
+    assert "stems/full.ogg" in names              # audio lives where the format says
+    assert "original_audio" not in manifest
+    assert manifest["stems"][0]["id"] == "full"
+    assert mig.verify_zip(pak) == "ok"
+
+
+def test_migrate_preserves_the_mixdown_bytes(tmp_path: Path):
+    """It is a rename, not a re-encode. Losing a byte here loses the master audio."""
+    pak = _write_pack(tmp_path / "song.feedpak", _manifest())
+    mig.migrate_zip(pak, dry_run=False)
+    with zipfile.ZipFile(pak) as zf:
+        assert zf.read("stems/full.ogg") == b"MIXDOWN"
+        assert zf.read("stems/guitar.ogg") == b"g"
+
+
+def test_migrate_is_idempotent(tmp_path: Path):
+    pak = _write_pack(tmp_path / "song.feedpak", _manifest())
+    assert mig.migrate_zip(pak, dry_run=False) == "migrated"
+    before = pak.read_bytes()
+    assert mig.migrate_zip(pak, dry_run=False) == "skip"
+    assert pak.read_bytes() == before  # a re-run touches nothing
+
+
+def test_dry_run_changes_nothing(tmp_path: Path):
+    pak = _write_pack(tmp_path / "song.feedpak", _manifest())
+    before = pak.read_bytes()
+    assert mig.migrate_zip(pak, dry_run=True) == "would-migrate"
+    assert pak.read_bytes() == before
+
+
+def test_migrate_refuses_when_the_mixdown_is_absent(tmp_path: Path):
+    """The key points at audio the archive doesn't contain. Fabricating a stem
+    entry for a missing file would break every reader — refuse, don't guess."""
+    pak = _write_pack(
+        tmp_path / "song.feedpak",
+        _manifest(),
+        files={"stems/guitar.ogg": b"g", "arrangements/lead.json": b"{}"},
+    )
+    before = pak.read_bytes()
+    assert mig.migrate_zip(pak, dry_run=False) == "missing-audio"
+    assert pak.read_bytes() == before
+
+
+def test_migrate_refuses_when_the_target_path_is_taken(tmp_path: Path):
+    """A `stems/full.ogg` that is NOT the mixdown already occupies the target.
+    Overwriting it would destroy a stem."""
+    pak = _write_pack(
+        tmp_path / "song.feedpak",
+        _manifest(),
+        files={
+            "original/full.ogg": b"MIXDOWN",
+            "stems/full.ogg": b"SOMETHING-ELSE",
+            "arrangements/lead.json": b"{}",
+        },
+    )
+    assert mig.migrate_zip(pak, dry_run=False) == "target-occupied"
+    with zipfile.ZipFile(pak) as zf:
+        assert zf.read("stems/full.ogg") == b"SOMETHING-ELSE"
+
+
+def test_migrate_drops_a_stale_key_beside_a_non_canonical_full_stem(tmp_path: Path):
+    """The mixdown is already a stem, but at a path of the pack's own choosing —
+    which is legal (§2.2: readers resolve through the manifest, never by
+    filename). Only the dead key needs removing. Demanding `stems/full.ogg` here
+    would reject a perfectly valid pack as `missing-audio`."""
+    m = _manifest(stems=[{"id": "full", "file": "audio/mixdown.ogg", "default": "off"}])
+    pak = _write_pack(
+        tmp_path / "song.feedpak",
+        m,
+        files={"audio/mixdown.ogg": b"MIXDOWN", "arrangements/lead.json": b"{}"},
+    )
+    assert mig.migrate_zip(pak, dry_run=False) == "migrated"
+
+    manifest, names = _read(pak)
+    assert "original_audio" not in manifest
+    assert manifest["stems"] == [
+        {"id": "full", "file": "audio/mixdown.ogg", "default": "off"}
+    ]
+    assert "audio/mixdown.ogg" in names  # the audio never moved
+    assert mig.verify_zip(pak) == "ok"
+
+
+# ── verify_zip ──────────────────────────────────────────────────────────────
+
+def test_verify_rejects_a_retained_mixdown_that_plays_on_open(tmp_path: Path):
+    """The hazard the migration must never create: `full` alongside instrument
+    stems AND default-on means a summing reader plays the whole song twice."""
+    m = _manifest(
+        stems=[
+            {"id": "full", "file": "stems/full.ogg", "default": "on"},
+            {"id": "guitar", "file": "stems/guitar.ogg", "default": "on"},
+        ]
+    )
+    del m["original_audio"]
+    pak = _write_pack(
+        tmp_path / "song.feedpak",
+        m,
+        files={"stems/full.ogg": b"M", "stems/guitar.ogg": b"g"},
+    )
+    assert mig.verify_zip(pak) == "full-stem-default-on"
+
+
+@pytest.mark.parametrize(
+    "default, expected",
+    [
+        ({"default": "off"}, "ok"),          # the one safe, canonical shape
+        ({"default": "OFF"}, "ok"),          # case-insensitive
+        ({"default": " off "}, "ok"),        # surrounding whitespace tolerated
+        ({}, "full-stem-default-not-off"),   # MISSING — core defaults to True (ON)
+        ({"default": ""}, "full-stem-default-not-off"),      # empty → ON in core
+        ({"default": False}, "full-stem-default-not-off"),   # boolean, not the string
+        ({"default": True}, "full-stem-default-on"),         # boolean truthy → plays
+        ({"default": "false"}, "full-stem-default-not-off"), # off-ish but non-canonical
+        ({"default": "0"}, "full-stem-default-not-off"),
+        ({"default": "no"}, "full-stem-default-not-off"),
+        ({"default": "maybe"}, "full-stem-default-not-off"), # malformed
+        ({"default": "on"}, "full-stem-default-on"),
+        ({"default": "yes"}, "full-stem-default-on"),
+        ({"default": "1"}, "full-stem-default-on"),
+    ],
+)
+def test_verify_requires_an_explicit_off_on_a_retained_mixdown(tmp_path, default, expected):
+    """Beside instrument stems, `full` is safe only with an explicit normalized
+    `off`. Core defaults an ABSENT `default` to ON and treats empty/unknown as
+    ON, so a missing or blank default is the double-audio hazard itself, not a
+    lesser one — `verify` must not certify it."""
+    m = _manifest(
+        stems=[
+            {"id": "full", "file": "stems/full.ogg", **default},
+            {"id": "guitar", "file": "stems/guitar.ogg", "default": "on"},
+        ]
+    )
+    del m["original_audio"]
+    pak = _write_pack(
+        tmp_path / f"{tmp_path.name}.feedpak",
+        m,
+        files={"stems/full.ogg": b"M", "stems/guitar.ogg": b"g"},
+    )
+    assert mig.verify_zip(pak) == expected
+
+
+def test_verify_ignores_default_on_a_sole_full_stem(tmp_path: Path):
+    """A single `full` stem IS the audio — the len>1 gate means its default is
+    not policed, so an on/absent default is fine (off would mute the pack)."""
+    for default in ({"default": "on"}, {}, {"default": ""}):
+        m = _manifest(stems=[{"id": "full", "file": "stems/full.ogg", **default}])
+        del m["original_audio"]
+        pak = _write_pack(
+            tmp_path / f"{tmp_path.name}-{len(default)}.feedpak",
+            m,
+            files={"stems/full.ogg": b"M"},
+        )
+        assert mig.verify_zip(pak) == "ok"
+
+
+def test_verify_rejects_an_unmigrated_pack(tmp_path: Path):
+    pak = _write_pack(tmp_path / "song.feedpak", _manifest())
+    assert mig.verify_zip(pak) == "still-has-key"
+
+
+# ── Unsafe manifest paths must not be laundered into playable audio ─────────
+
+@pytest.mark.parametrize(
+    "rel", ["../outside.ogg", "/etc/passwd", "a/../../x.ogg", "C:/x.ogg", "a\\b.ogg"]
+)
+def test_migrate_refuses_an_unsafe_full_mix_path(tmp_path: Path, rel: str):
+    """Core's loader REFUSES a full-mix path that escapes the pack — such a pack
+    simply has no full mix, and the audio is inert. Migrating it into
+    `stems/full.ogg` would take content the reader deliberately rejected and hand
+    it back as a valid, playable stem. Report it; never promote it."""
+    pak = _write_pack(
+        tmp_path / "song.feedpak",
+        _manifest(original_audio=rel),
+        files={rel: b"EVIL", "stems/guitar.ogg": b"g"},
+    )
+    before = pak.read_bytes()
+    assert mig.migrate_zip(pak, dry_run=False) == "unsafe-path"
+    assert pak.read_bytes() == before
+
+
+def test_safe_relpath_accepts_ordinary_pack_paths():
+    assert mig.is_safe_relpath("stems/full.ogg")
+    assert mig.is_safe_relpath("original/full.ogg")
+    assert not mig.is_safe_relpath("")
+    assert not mig.is_safe_relpath("a//b.ogg")
+
+
+# ── Damaged packs must not abort the run ────────────────────────────────────
+
+def test_a_corrupt_archive_is_reported_not_fatal(tmp_path: Path, capsys):
+    """A real library has damage in it — a truncated download, an archive left
+    half-written by an interrupted converter. One of those must not kill a
+    50,000-pack run and throw away the summary: the pack is reported, skipped,
+    and everything else still migrates."""
+    good = _write_pack(tmp_path / "good.feedpak", _manifest())
+    bad = tmp_path / "bad.feedpak"
+    bad.write_bytes(b"this is not a zip file at all")
+
+    rc = mig.main([str(tmp_path)])
+    out = capsys.readouterr().out
+
+    assert rc == 1                       # a problem pack fails the run's exit code
+    assert "corrupt-zip" in out
+    assert "migrated" in out
+    assert mig.verify_zip(good) == "ok"  # the healthy pack still got migrated
+    assert bad.read_bytes() == b"this is not a zip file at all"  # untouched
+
+
+# ── Directory-form (authoring) packs are discovered, not silently skipped ────
+
+def _write_dir_pack(path: Path, manifest: dict, files: dict[str, bytes] | None = None) -> Path:
+    """Build a directory-form pack (`song.sloppak/`), the authoring shape."""
+    files = files or {
+        "original/full.ogg": b"MIXDOWN",
+        "stems/guitar.ogg": b"g",
+        "stems/drums.ogg": b"d",
+        "arrangements/lead.json": b"{}",
+    }
+    path.mkdir()
+    (path / "manifest.yaml").write_text(yaml.safe_dump(manifest, sort_keys=False))
+    for name, data in files.items():
+        p = path / name
+        p.parent.mkdir(parents=True, exist_ok=True)
+        p.write_bytes(data)
+    return path
+
+
+def test_iter_packs_discovers_directory_form_packs(tmp_path: Path):
+    """A `song.sloppak/` directory is a pack; os.walk must yield it whole and
+    NOT descend into it (its stems/ are contents, not packs)."""
+    d = _write_dir_pack(tmp_path / "song.sloppak", _manifest())
+    z = _write_pack(tmp_path / "other.feedpak", _manifest())
+    found = set(mig.iter_packs(tmp_path))
+    assert d in found and z in found
+    # Nothing inside the directory pack was yielded as its own pack.
+    assert not any(d in p.parents for p in found)
+
+
+def test_iter_packs_yields_a_directly_passed_dir_pack(tmp_path: Path):
+    d = _write_dir_pack(tmp_path / "song.sloppak", _manifest())
+    assert list(mig.iter_packs(d)) == [d]
+
+
+def test_directory_form_pack_is_reported_not_silently_skipped(tmp_path: Path, capsys):
+    """The migrator rewrites single-file packs atomically; a directory can't be
+    swapped that way, so it is surfaced as a problem rather than vanishing from
+    the run (the silent-skip this guards against) or being rewritten unsafely."""
+    d = _write_dir_pack(tmp_path / "song.sloppak", _manifest())
+    good = _write_pack(tmp_path / "good.feedpak", _manifest())
+
+    rc = mig.main([str(tmp_path)])
+    out = capsys.readouterr().out
+
+    assert rc == 1                              # a reported problem fails the exit code
+    assert "dir-form-unsupported" in out
+    assert mig.verify_zip(good) == "ok"         # the zip pack still migrated
+    # The directory pack is untouched: legacy key intact, mixdown not moved.
+    manifest = yaml.safe_load((d / "manifest.yaml").read_text())
+    assert manifest.get("original_audio") == "original/full.ogg"
+    assert (d / "original" / "full.ogg").read_bytes() == b"MIXDOWN"
+
+
+def test_verify_reports_directory_form_packs(tmp_path: Path):
+    d = _write_dir_pack(tmp_path / "song.sloppak", _manifest())
+    assert mig.verify_pack(d) == "dir-form-unsupported"

tests/test_resolved_root_cache.py

@@ -0,0 +1,103 @@
+"""The library root must be resolved ONCE, not on every path check.
+
+`Path.resolve()` lstats every component of a path. `_resolve_dlc_path` and
+`safe_join` run once per song / art fetch / scanned row, and both used to
+re-resolve their root every single call.
+
+Measured on a real 50,944-song library sitting on an NTFS-3G (FUSE) mount:
+~23,500 stat/lstat calls per second, re-walking the same three parent
+directories, pinning a core of the server. Every stat crosses into userspace on
+FUSE, so the constant re-resolution — not the work itself — was the cost.
+
+These tests pin the fix (root resolved once) AND that caching it did not weaken
+containment, which is the thing that matters: `safe_join` is the zip-slip guard.
+"""
+
+from pathlib import Path
+
+import pytest
+
+from dlc_paths import _resolve_dlc_path
+from safepath import resolved_root, safe_join
+
+
+@pytest.fixture(autouse=True)
+def _clear_cache():
+    resolved_root.cache_clear()
+    yield
+    resolved_root.cache_clear()
+
+
+def test_dlc_root_is_resolved_once_across_many_lookups(tmp_path):
+    """The regression: 500 lookups must not mean 500 root resolutions."""
+    (tmp_path / "a.feedpak").write_bytes(b"x")
+
+    for i in range(500):
+        assert _resolve_dlc_path(tmp_path, f"song{i}.feedpak") is not None
+
+    info = resolved_root.cache_info()
+    assert info.misses == 1, (
+        f"the library root must be resolved ONCE, not per call "
+        f"(got {info.misses} resolutions for 500 lookups)"
+    )
+    assert info.hits == 499
+
+
+def test_safe_join_resolves_its_root_once_too(tmp_path):
+    for i in range(200):
+        assert safe_join(tmp_path, f"asset{i}.png") is not None
+    assert resolved_root.cache_info().misses == 1
+
+
+def test_a_different_root_is_a_different_cache_entry(tmp_path):
+    other = tmp_path / "other"
+    other.mkdir()
+    _resolve_dlc_path(tmp_path, "a.feedpak")
+    _resolve_dlc_path(other, "a.feedpak")
+    assert resolved_root.cache_info().misses == 2, "switching library dir must re-resolve"
+
+
+# ── containment must be unchanged (the part that matters) ───────────────────
+
+@pytest.mark.parametrize("evil", [
+    "../etc/passwd",
+    "..\\etc\\passwd",
+    "a/../../etc/passwd",
+    "/etc/passwd",
+    "C:/Windows/system.ini",
+    "",
+])
+def test_resolve_dlc_path_still_rejects_escapes(tmp_path, evil):
+    assert _resolve_dlc_path(tmp_path, evil) is None
+
+
+@pytest.mark.parametrize("evil", [
+    "../outside.txt",
+    "..\\outside.txt",
+    "a/../../outside.txt",
+    "",
+])
+def test_safe_join_still_rejects_escapes(tmp_path, evil):
+    assert safe_join(tmp_path, evil) is None
+
+
+def test_safe_join_still_follows_symlinks_out(tmp_path):
+    """safe_join's candidate resolution is the zip-slip defence and is NOT cached:
+    a symlink pointing outside the root must still be refused."""
+    outside = tmp_path.parent / "outside_secret"
+    outside.mkdir(exist_ok=True)
+    (outside / "secret.txt").write_text("x")
+
+    root = tmp_path / "root"
+    root.mkdir()
+    (root / "escape").symlink_to(outside)
+
+    assert safe_join(root, "escape/secret.txt") is None, (
+        "a symlink escaping the root must still be rejected — caching the ROOT "
+        "must not disable resolution of the CANDIDATE"
+    )
+
+
+def test_in_library_paths_still_resolve(tmp_path):
+    assert _resolve_dlc_path(tmp_path, "sub/song.feedpak") == tmp_path / "sub" / "song.feedpak"
+    assert safe_join(tmp_path, "art/cover.png") == (tmp_path / "art" / "cover.png").resolve()

tests/test_sloppak_full_mix_load.py

@@ -0,0 +1,277 @@
+"""The sloppak loader's handling of a pack's complete mixdown (#933).
+
+The mixdown is a stem: feedpak spec §5.3 RESERVES the id `full` for it. It is a
+mixdown, not a layer — it already contains every instrument, so a reader that
+sums `stems` must never include it in that sum, and `load_song()` therefore
+lifts it OUT of `LoadedSloppak.stems` and onto `LoadedSloppak.full_mix`.
+
+Also covers the DEPRECATED `original_audio:` manifest key — a key this repo
+invented (#583) before the spec reserved `full`, which every pack in the wild
+still carries. We read it as a fallback so those packs keep their full mix; we
+never write it. Those tests are the deprecation contract: they go when the key
+does (#945).
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import yaml
+
+import sloppak as sloppak_mod
+
+
+def _write_dir_sloppak(
+    root: Path,
+    manifest_extras: dict,
+    *,
+    write_legacy_full_mix: bool = False,
+    stems: list[dict] | None = None,
+) -> Path:
+    """Build a minimal directory-form sloppak that load_song will accept.
+
+    Uses the tmp_path leaf name to make the sloppak filename unique per test,
+    avoiding the module-level ``resolve_source_dir`` cache being poisoned by a
+    previous test that happened to share the same "song.sloppak" filename.
+    """
+    pak = root / f"{root.name}.sloppak"
+    pak.mkdir()
+    arr_dir = pak / "arrangements"
+    arr_dir.mkdir()
+
+    arr = {
+        "name": "Lead",
+        "tuning": [0, 0, 0, 0, 0, 0],
+        "capo": 0,
+        "notes": [],
+        "chords": [],
+        "anchors": [],
+        "handshapes": [],
+        "templates": [],
+        "beats": [],
+        "sections": [],
+    }
+    (arr_dir / "lead.json").write_text(json.dumps(arr))
+
+    manifest = {
+        "title": "Test",
+        "artist": "Tester",
+        "album": "",
+        "year": 2026,
+        "duration": 10.0,
+        "arrangements": [{"id": "lead", "name": "Lead", "file": "arrangements/lead.json"}],
+        "stems": (
+            stems
+            if stems is not None
+            else [{"id": "guitar", "file": "stems/guitar.ogg", "default": True}]
+        ),
+    }
+    manifest.update(manifest_extras)
+    (pak / "manifest.yaml").write_text(yaml.safe_dump(manifest, sort_keys=False))
+
+    if write_legacy_full_mix:
+        orig_dir = pak / "original"
+        orig_dir.mkdir()
+        # The loader only checks presence (is_file); contents are irrelevant.
+        (orig_dir / "full.ogg").write_bytes(b"OggS-not-real")
+
+    return pak
+
+
+def _load(pak_path: Path, tmp_path: Path):
+    dlc_root = pak_path.parent
+    cache = tmp_path / "cache"
+    cache.mkdir()
+    return sloppak_mod.load_song(pak_path.name, dlc_root, cache)
+
+
+def _separated(**extra) -> list[dict]:
+    """A separated pack that RETAINS its mixdown, as spec §5.3 asks writers to."""
+    return [
+        {"id": "full", "file": "stems/full.ogg", "default": False, **extra},
+        {"id": "guitar", "file": "stems/guitar.ogg", "default": True},
+        {"id": "drums", "file": "stems/drums.ogg", "default": True},
+    ]
+
+
+# ── The `full` stem is the mixdown (spec §5.3) ───────────────────────────────
+
+def test_full_stem_is_surfaced_as_the_mixdown(tmp_path: Path):
+    pak = _write_dir_sloppak(tmp_path, {}, stems=_separated())
+    loaded = _load(pak, tmp_path)
+    # Manifest-relative, so the WS builds its URL exactly as it builds a stem's.
+    assert loaded.full_mix == "stems/full.ogg"
+
+
+def test_full_stem_is_removed_from_the_stem_list(tmp_path: Path):
+    """The regression this whole change exists to prevent.
+
+    Every consumer sums `stems` into one mix and renders one fader per entry. The
+    mixdown already contains every instrument, so leaving it in the list doubles
+    the entire song — and muting `guitar` would still leave guitar audible inside
+    it. That exact trap is why the packer invented `original_audio` rather than
+    putting the mixdown where the format says it goes.
+    """
+    pak = _write_dir_sloppak(tmp_path, {}, stems=_separated())
+    loaded = _load(pak, tmp_path)
+    assert [s["id"] for s in loaded.stems] == ["guitar", "drums"]
+
+
+def test_single_mix_pack_keeps_full_as_its_only_stem(tmp_path: Path):
+    """A pack whose ONLY stem is `full` is a single-mix pack, not a separated one.
+
+    There are no instruments to be pristine against, so the mixdown stays the sole
+    playable stem and nothing is surfaced separately. Anything else would strip the
+    stem list of the most common pack shape in the library and leave it silent.
+    """
+    pak = _write_dir_sloppak(
+        tmp_path, {}, stems=[{"id": "full", "file": "stems/full.ogg", "default": True}]
+    )
+    loaded = _load(pak, tmp_path)
+    assert loaded.full_mix is None
+    assert [s["id"] for s in loaded.stems] == ["full"]
+
+
+def test_every_full_entry_is_removed_not_just_the_first(tmp_path: Path):
+    """A malformed pack listing `full` twice must not leave one behind.
+
+    Removing the mixdown by object identity would drop only the entry we surface
+    and leave its duplicate in the stem list — a whole copy of the song, summed
+    with the instruments. That is the exact bug this partition prevents, so a
+    duplicate must not smuggle it back in.
+    """
+    pak = _write_dir_sloppak(
+        tmp_path,
+        {},
+        stems=[
+            {"id": "full", "file": "stems/full.ogg", "default": False},
+            {"id": "guitar", "file": "stems/guitar.ogg", "default": True},
+            {"id": "full", "file": "original/full.ogg", "default": True},
+        ],
+    )
+    loaded = _load(pak, tmp_path)
+    assert loaded.full_mix == "stems/full.ogg"
+    assert [s["id"] for s in loaded.stems] == ["guitar"]
+
+
+def test_separated_pack_without_a_full_stem_has_no_mixdown(tmp_path: Path):
+    """Stems only, mixdown discarded — the pre-1.15.0 shape. Nothing to surface."""
+    pak = _write_dir_sloppak(
+        tmp_path,
+        {},
+        stems=[
+            {"id": "guitar", "file": "stems/guitar.ogg", "default": True},
+            {"id": "drums", "file": "stems/drums.ogg", "default": True},
+        ],
+    )
+    loaded = _load(pak, tmp_path)
+    assert loaded.full_mix is None
+    assert [s["id"] for s in loaded.stems] == ["guitar", "drums"]
+
+
+def test_single_mix_pack_ignores_a_lingering_deprecated_key(tmp_path: Path):
+    """`full` is the pack's only stem AND the old key is still there.
+
+    The stem wins, and it stays the sole playable stem — falling back to the key
+    would surface the mixdown twice: once as the stem the player is already
+    playing, and once as a "pristine" track for it to cross over to.
+    """
+    pak = _write_dir_sloppak(
+        tmp_path,
+        {"original_audio": "original/full.ogg"},
+        stems=[{"id": "full", "file": "stems/full.ogg", "default": True}],
+        write_legacy_full_mix=True,
+    )
+    loaded = _load(pak, tmp_path)
+    assert loaded.full_mix is None
+    assert [s["id"] for s in loaded.stems] == ["full"]
+
+
+def test_full_stem_wins_over_the_deprecated_key(tmp_path: Path):
+    """A migrated pack that still carries the old key must use the stem."""
+    pak = _write_dir_sloppak(
+        tmp_path,
+        {"original_audio": "original/full.ogg"},
+        stems=_separated(),
+        write_legacy_full_mix=True,
+    )
+    loaded = _load(pak, tmp_path)
+    assert loaded.full_mix == "stems/full.ogg"
+
+
+# ── The library index must not advertise the mixdown as an instrument ────────
+
+def test_extract_meta_excludes_the_mixdown_from_stem_ids(tmp_path: Path):
+    """The library's stem chips / stem_count come from here, and must agree with
+    load_song() — otherwise the filter offers a "full" chip beside guitar+drums
+    and counts a third stem that no mixer will ever show."""
+    pak = _write_dir_sloppak(tmp_path, {}, stems=_separated())
+    meta = sloppak_mod.extract_meta(pak)
+    assert meta["stem_ids"] == ["guitar", "drums"]
+    assert meta["stem_count"] == 2
+
+
+def test_extract_meta_keeps_full_for_a_single_mix_pack(tmp_path: Path):
+    pak = _write_dir_sloppak(
+        tmp_path, {}, stems=[{"id": "full", "file": "stems/full.ogg", "default": True}]
+    )
+    meta = sloppak_mod.extract_meta(pak)
+    assert meta["stem_ids"] == ["full"]
+    assert meta["stem_count"] == 1
+
+
+# ── DEPRECATED `original_audio:` fallback — delete with the key (#945) ───────
+
+def test_legacy_key_still_provides_the_full_mix(tmp_path: Path):
+    """Every pack written before the spec reserved `full` looks like this. Dropping
+    the read would silently take the pristine mix away from all of them."""
+    pak = _write_dir_sloppak(
+        tmp_path, {"original_audio": "original/full.ogg"}, write_legacy_full_mix=True
+    )
+    loaded = _load(pak, tmp_path)
+    assert loaded.full_mix == "original/full.ogg"
+    # The legacy mixdown lives OUTSIDE `stems`, so the stem list is untouched.
+    assert [s["id"] for s in loaded.stems] == ["guitar"]
+
+
+def test_legacy_key_absent_means_no_full_mix(tmp_path: Path):
+    pak = _write_dir_sloppak(tmp_path, {}, write_legacy_full_mix=True)
+    loaded = _load(pak, tmp_path)
+    assert loaded.full_mix is None
+
+
+def test_legacy_key_none_when_file_missing(tmp_path: Path):
+    # Manifest points at a full mix that isn't on disk — disabled silently.
+    pak = _write_dir_sloppak(
+        tmp_path, {"original_audio": "original/full.ogg"}, write_legacy_full_mix=False
+    )
+    loaded = _load(pak, tmp_path)
+    assert loaded.full_mix is None
+
+
+def test_legacy_key_none_when_value_blank(tmp_path: Path):
+    pak = _write_dir_sloppak(
+        tmp_path, {"original_audio": "   "}, write_legacy_full_mix=True
+    )
+    loaded = _load(pak, tmp_path)
+    assert loaded.full_mix is None
+
+
+# ── Security / path-traversal branches (legacy key only — a stem `file` is
+#    resolved through the same /api/sloppak/.../file/ guard as every other stem)
+
+def test_legacy_key_none_when_path_escapes_sloppak(tmp_path: Path):
+    pak = _write_dir_sloppak(
+        tmp_path, {"original_audio": "../outside.ogg"}, write_legacy_full_mix=True
+    )
+    loaded = _load(pak, tmp_path)
+    assert loaded.full_mix is None
+
+
+def test_legacy_key_none_when_path_is_absolute(tmp_path: Path):
+    pak = _write_dir_sloppak(
+        tmp_path, {"original_audio": "/etc/passwd"}, write_legacy_full_mix=True
+    )
+    loaded = _load(pak, tmp_path)
+    assert loaded.full_mix is None

tests/test_sloppak_original_audio_load.py

@@ -1,119 +0,0 @@
-"""End-to-end test for the sloppak loader recognising an `original_audio:`
-manifest key (the single full-mix file shipped alongside the separate stems)
-and surfacing the manifest-relative path on the LoadedSloppak."""
-
-from __future__ import annotations
-
-import json
-from pathlib import Path
-
-import yaml
-
-import sloppak as sloppak_mod
-
-
-def _write_dir_sloppak(root: Path, manifest_extras: dict, *, write_full_mix: bool) -> Path:
-    """Build a minimal directory-form sloppak that load_song will accept.
-
-    Uses the tmp_path leaf name to make the sloppak filename unique per test,
-    avoiding the module-level ``resolve_source_dir`` cache being poisoned by a
-    previous test that happened to share the same "song.sloppak" filename.
-    """
-    pak = root / f"{root.name}.sloppak"
-    pak.mkdir()
-    arr_dir = pak / "arrangements"
-    arr_dir.mkdir()
-
-    arr = {
-        "name": "Lead",
-        "tuning": [0, 0, 0, 0, 0, 0],
-        "capo": 0,
-        "notes": [],
-        "chords": [],
-        "anchors": [],
-        "handshapes": [],
-        "templates": [],
-        "beats": [],
-        "sections": [],
-    }
-    (arr_dir / "lead.json").write_text(json.dumps(arr))
-
-    manifest = {
-        "title": "Test",
-        "artist": "Tester",
-        "album": "",
-        "year": 2026,
-        "duration": 10.0,
-        "arrangements": [{"id": "lead", "name": "Lead", "file": "arrangements/lead.json"}],
-        "stems": [{"id": "guitar", "file": "stems/guitar.ogg", "default": True}],
-    }
-    manifest.update(manifest_extras)
-    (pak / "manifest.yaml").write_text(yaml.safe_dump(manifest, sort_keys=False))
-
-    if write_full_mix:
-        orig_dir = pak / "original"
-        orig_dir.mkdir()
-        # The loader only checks presence (is_file); contents are irrelevant.
-        (orig_dir / "full.ogg").write_bytes(b"OggS-not-real")
-
-    return pak
-
-
-def _load(pak_path: Path, tmp_path: Path):
-    dlc_root = pak_path.parent
-    cache = tmp_path / "cache"
-    cache.mkdir()
-    return sloppak_mod.load_song(pak_path.name, dlc_root, cache)
-
-
-# ── Happy path ───────────────────────────────────────────────────────────────
-
-def test_load_song_attaches_original_audio_when_manifest_opts_in(tmp_path: Path):
-    pak = _write_dir_sloppak(
-        tmp_path, {"original_audio": "original/full.ogg"}, write_full_mix=True
-    )
-    loaded = _load(pak, tmp_path)
-    # Stored as the manifest-relative string so server.py can build the URL the
-    # same way it builds stem URLs.
-    assert loaded.original_audio == "original/full.ogg"
-
-
-# ── Absent / degraded branches ───────────────────────────────────────────────
-
-def test_load_song_original_audio_none_when_manifest_silent(tmp_path: Path):
-    pak = _write_dir_sloppak(tmp_path, {}, write_full_mix=True)
-    loaded = _load(pak, tmp_path)
-    assert loaded.original_audio is None
-
-
-def test_load_song_original_audio_none_when_file_missing(tmp_path: Path):
-    # Manifest points at a full mix that isn't on disk — disabled silently.
-    pak = _write_dir_sloppak(
-        tmp_path, {"original_audio": "original/full.ogg"}, write_full_mix=False
-    )
-    loaded = _load(pak, tmp_path)
-    assert loaded.original_audio is None
-
-
-def test_load_song_original_audio_none_when_value_blank(tmp_path: Path):
-    pak = _write_dir_sloppak(tmp_path, {"original_audio": "   "}, write_full_mix=True)
-    loaded = _load(pak, tmp_path)
-    assert loaded.original_audio is None
-
-
-# ── Security / path-traversal branches ──────────────────────────────────────
-
-def test_load_song_original_audio_none_when_path_escapes_sloppak(tmp_path: Path):
-    pak = _write_dir_sloppak(
-        tmp_path, {"original_audio": "../outside.ogg"}, write_full_mix=True
-    )
-    loaded = _load(pak, tmp_path)
-    assert loaded.original_audio is None
-
-
-def test_load_song_original_audio_none_when_path_is_absolute(tmp_path: Path):
-    pak = _write_dir_sloppak(
-        tmp_path, {"original_audio": "/etc/passwd"}, write_full_mix=True
-    )
-    loaded = _load(pak, tmp_path)
-    assert loaded.original_audio is None

tests/test_sloppak_unpack_cache.py

@@ -0,0 +1,309 @@
+"""The unpack cache is bounded, and reading part of a song doesn't explode it.
+
+`sloppak_cache/` holds every song ever unpacked, fully decompressed. Stems are
+already-compressed audio, so an unpacked song is ~1.1x its zip — the cache is a
+second copy of the library. It used to have no cap, no LRU, and no cleanup at
+all: a tester reached 60 GB from an 1800-song library because one caller looped
+the library calling load_song() (rig_builder's library-wide tone batch), which
+unpacks the WHOLE pack — stems included — to read a few KB of tone JSON.
+
+Pins, so neither half can silently come back:
+  - resolve_source_dir() evicts LRU songs to stay under the cap,
+  - it never evicts the song the caller just asked for,
+  - an evicted song is dropped from _source_cache too (otherwise the media route
+    keeps serving a path that no longer exists and 404s every stem instead of
+    re-unpacking),
+  - get_cached_source_dir() self-heals if the cache dir is deleted by hand,
+  - read_member_bytes() reads one file WITHOUT unpacking anything.
+"""
+
+import importlib
+import zipfile
+
+import pytest
+import yaml
+
+import sloppak as sloppak_mod
+
+
+STEM = b"\x00" * (400 * 1024)   # 400 KB of "audio" — the bulk of a real pack
+ARR = b'{"tones": {"definitions": [{"Key": "clean"}]}}'
+
+
+def _zip_pack(path, stem_bytes=STEM):
+    with zipfile.ZipFile(path, "w") as zf:
+        zf.writestr("manifest.yaml", yaml.safe_dump({
+            "title": path.stem,
+            "arrangements": [{"file": "arrangements/lead.json", "name": "Lead"}],
+            "stems": [{"id": "full", "file": "stems/audio.ogg"}],
+        }))
+        zf.writestr("arrangements/lead.json", ARR)
+        zf.writestr("stems/audio.ogg", stem_bytes)
+    return path
+
+
+@pytest.fixture(autouse=True)
+def _fresh_module_state():
+    # _source_cache is module state and would leak across tests.
+    importlib.reload(sloppak_mod)
+    yield
+    importlib.reload(sloppak_mod)
+
+
+def _cap_mb(monkeypatch, mb):
+    monkeypatch.setenv("FEEDBACK_SLOPPAK_CACHE_MAX_MB", str(mb))
+
+
+def test_read_member_bytes_does_not_unpack(tmp_path, monkeypatch):
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    cache = tmp_path / "cache"
+    cache.mkdir()
+    pack = _zip_pack(dlc / "song.feedpak")
+
+    data = sloppak_mod.read_member_bytes(pack, "arrangements/lead.json")
+
+    assert data == ARR
+    assert list(cache.iterdir()) == [], (
+        "reading one member must not unpack the pack — this is the whole point: "
+        "load_song() would have written the 400 KB stem to disk to get 45 bytes of JSON"
+    )
+
+
+def test_read_member_bytes_missing_member_is_none(tmp_path):
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    pack = _zip_pack(dlc / "song.feedpak")
+    assert sloppak_mod.read_member_bytes(pack, "arrangements/nope.json") is None
+    assert sloppak_mod.read_member_bytes(pack, "") is None
+
+
+def test_unpack_cache_evicts_lru_to_stay_under_cap(tmp_path, monkeypatch):
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    cache = tmp_path / "cache"
+    cache.mkdir()
+    _cap_mb(monkeypatch, 1)                       # 1 MB — holds ~2 of our 400 KB packs
+
+    for i in range(6):
+        _zip_pack(dlc / f"song{i}.feedpak")
+
+    for i in range(6):
+        sloppak_mod.resolve_source_dir(f"song{i}.feedpak", dlc, cache)
+
+    total = sum(f.stat().st_size for f in cache.rglob("*") if f.is_file())
+    assert total <= 1 * 1024 * 1024, (
+        f"unpack cache ran to {total/1e6:.1f} MB against a 1 MB cap — this is the "
+        "unbounded growth that reached 60 GB in the field"
+    )
+    # The most recent song must survive; the oldest must not.
+    names = {d.name for d in cache.iterdir()}
+    assert "song5.feedpak" in names, "the song just resolved must never be evicted"
+    assert "song0.feedpak" not in names, "the least-recently-used song should go first"
+
+
+def test_eviction_drops_the_source_cache_entry(tmp_path, monkeypatch):
+    """An evicted song must not keep being handed out by get_cached_source_dir().
+
+    media.py only falls back to resolve_source_dir() when this returns None. If a
+    stale path survives, every stem 404s for the rest of the process instead of
+    re-unpacking — a silently broken song, not a slow one.
+    """
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    cache = tmp_path / "cache"
+    cache.mkdir()
+    _cap_mb(monkeypatch, 1)
+
+    for i in range(6):
+        _zip_pack(dlc / f"song{i}.feedpak")
+    for i in range(6):
+        sloppak_mod.resolve_source_dir(f"song{i}.feedpak", dlc, cache)
+
+    evicted = sloppak_mod.get_cached_source_dir("song0.feedpak")
+    assert evicted is None, "an evicted song must be dropped from _source_cache"
+
+    # ...and asking for it again just re-unpacks it. Self-healing, not broken.
+    again = sloppak_mod.resolve_source_dir("song0.feedpak", dlc, cache)
+    assert (again / "stems" / "audio.ogg").is_file()
+
+
+def test_get_cached_source_dir_self_heals_after_manual_delete(tmp_path, monkeypatch):
+    """Telling a user to delete sloppak_cache/ to reclaim disk must be safe."""
+    import shutil
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    cache = tmp_path / "cache"
+    cache.mkdir()
+    _cap_mb(monkeypatch, 0)                       # eviction off — isolate the delete
+    _zip_pack(dlc / "song.feedpak")
+
+    src = sloppak_mod.resolve_source_dir("song.feedpak", dlc, cache)
+    assert sloppak_mod.get_cached_source_dir("song.feedpak") == src
+
+    shutil.rmtree(src)                            # the user clears the folder
+
+    assert sloppak_mod.get_cached_source_dir("song.feedpak") is None, (
+        "a path that no longer exists must not be served — the caller would 404 "
+        "every stem instead of re-unpacking"
+    )
+    assert (sloppak_mod.resolve_source_dir("song.feedpak", dlc, cache)
+            / "stems" / "audio.ogg").is_file()
+
+
+def test_cap_of_zero_disables_eviction(tmp_path, monkeypatch):
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    cache = tmp_path / "cache"
+    cache.mkdir()
+    _cap_mb(monkeypatch, 0)
+    for i in range(4):
+        _zip_pack(dlc / f"song{i}.feedpak")
+    for i in range(4):
+        sloppak_mod.resolve_source_dir(f"song{i}.feedpak", dlc, cache)
+    assert len(list(cache.iterdir())) == 4, "cap 0 must mean 'never evict'"
+
+
+def test_read_member_bytes_normalizes_non_canonical_names(tmp_path):
+    """A manifest may name a member './arrangements/lead.json' — valid, and it
+    resolved fine once unpacked. Reading the zip member by the raw string would
+    KeyError and silently report no tones. Same trap read_cover_bytes already hit."""
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    pack = _zip_pack(dlc / "song.feedpak")
+
+    assert sloppak_mod.read_member_bytes(pack, "./arrangements/lead.json") == ARR
+    assert sloppak_mod.read_member_bytes(pack, "stems/../arrangements/lead.json") == ARR
+    assert sloppak_mod.read_member_bytes(pack, "arrangements\\lead.json") == ARR
+
+
+def test_read_member_bytes_rejects_zip_slip(tmp_path):
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    pack = _zip_pack(dlc / "song.feedpak")
+    assert sloppak_mod.read_member_bytes(pack, "../../etc/passwd") is None
+    assert sloppak_mod.read_member_bytes(pack, "/etc/passwd") is None
+    assert sloppak_mod.read_member_bytes(pack, ".") is None
+
+
+def test_eviction_never_deletes_an_in_flight_unpack(tmp_path, monkeypatch):
+    """Two unpacks run concurrently (_UNPACK_MAX_CONCURRENCY = 2). One finishing
+    must not rmtree the other's half-written dir — that resolver would then cache
+    an incomplete song and serve a broken pack.
+
+    Sized so the sweep genuinely has to reach the in-flight directory: each pack
+    is ~700 KB against a 1 MB cap, so once `keep` is protected the sweep must
+    delete EVERY other dir to get under the cap — including the one being written.
+    (A naive version of this test passes even without the guard, because a
+    freshly-created dir is the most-recently-used and the sweep never gets to it.)
+    """
+    import threading
+
+    big = b"\x00" * (700 * 1024)
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    cache = tmp_path / "cache"
+    cache.mkdir()
+    _cap_mb(monkeypatch, 1)
+    for i in range(3):
+        _zip_pack(dlc / f"song{i}.feedpak", stem_bytes=big)
+
+    victim = cache / "song2.feedpak"
+    started = threading.Event()
+    release = threading.Event()
+    real_unpack = sloppak_mod._unpack_zip
+
+    def slow_unpack(zip_path, dest):
+        real_unpack(zip_path, dest)          # dir now exists — "half written"
+        if dest == victim:
+            started.set()
+            release.wait(5)                  # hold it open while the other sweeps
+
+    monkeypatch.setattr(sloppak_mod, "_unpack_zip", slow_unpack)
+
+    t = threading.Thread(target=sloppak_mod.resolve_source_dir,
+                         args=("song2.feedpak", dlc, cache))
+    t.start()
+    assert started.wait(5), "victim unpack did not start"
+
+    # song0 lands and sweeps: keep=song0, cache holds song0+song2 = 1.4 MB > 1 MB,
+    # so the sweep MUST try to delete song2 — which is still being written.
+    sloppak_mod.resolve_source_dir("song0.feedpak", dlc, cache)
+    in_flight_survived = victim.is_dir()
+
+    release.set()
+    t.join(5)
+
+    assert in_flight_survived, (
+        "eviction deleted a directory another thread was still unpacking into — "
+        "that resolver caches an incomplete song and serves a broken pack"
+    )
+
+
+def test_read_member_bytes_finds_backslash_members(tmp_path):
+    """Windows-authored packs store members as 'arrangements\\lead.json'.
+    _unpack_zip() normalizes those on extract, so unpack-then-read found them.
+    An exact getinfo() would not — and we'd silently report the song has no tones."""
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    pack = dlc / "win.feedpak"
+    with zipfile.ZipFile(pack, "w") as zf:
+        zf.writestr("manifest.yaml", yaml.safe_dump({"title": "w"}))
+        zf.writestr("arrangements\\lead.json", ARR)      # backslash member name
+
+    assert sloppak_mod.read_member_bytes(pack, "arrangements/lead.json") == ARR
+
+
+def test_read_member_bytes_finds_non_canonical_STORED_names(tmp_path):
+    """The archive itself may store './arrangements/lead.json'. _unpack_zip()
+    normalizes stored names on extract, so unpack-then-read resolved it. Both the
+    requested path and the stored name must be normalized, or the tones vanish."""
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    pack = dlc / "odd.feedpak"
+    with zipfile.ZipFile(pack, "w") as zf:
+        zf.writestr("manifest.yaml", yaml.safe_dump({"title": "o"}))
+        zf.writestr("./arrangements/lead.json", ARR)     # stored non-canonically
+
+    assert sloppak_mod.read_member_bytes(pack, "arrangements/lead.json") == ARR
+
+
+def test_read_member_bytes_matches_unpack_last_write_wins(tmp_path):
+    """If a pack stores two names that normalize to the same file, _unpack_zip
+    writes them in order and the LAST one is what ends up on disk. Reading the
+    raw member by exact name would hand back the first — stale arrangement data
+    that no unpacked read would ever have produced."""
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    pack = dlc / "dupe.feedpak"
+    with zipfile.ZipFile(pack, "w") as zf:
+        zf.writestr("manifest.yaml", yaml.safe_dump({"title": "d"}))
+        zf.writestr("arrangements/lead.json", b'{"tones": {"definitions": [{"Key": "STALE"}]}}')
+        zf.writestr("./arrangements/lead.json", ARR)      # normalizes to the same path
+
+    assert sloppak_mod.read_member_bytes(pack, "arrangements/lead.json") == ARR
+
+
+def test_failed_unpack_does_not_leave_the_dir_un_evictable(tmp_path, monkeypatch):
+    """A dir marked in-flight is skipped by eviction. If a failed unpack leaves the
+    marker behind, that dir becomes permanently un-evictable — a slow leak of
+    exactly the thing this cap exists to prevent."""
+    dlc = tmp_path / "dlc"
+    dlc.mkdir()
+    cache = tmp_path / "cache"
+    cache.mkdir()
+    _cap_mb(monkeypatch, 1)
+    _zip_pack(dlc / "boom.feedpak")
+
+    def blow_up(zip_path, dest):
+        dest.mkdir(parents=True, exist_ok=True)
+        raise OSError("disk full")
+
+    monkeypatch.setattr(sloppak_mod, "_unpack_zip", blow_up)
+    with pytest.raises(OSError):
+        sloppak_mod.resolve_source_dir("boom.feedpak", dlc, cache)
+
+    assert not sloppak_mod._unpacking, (
+        "a failed unpack left its destination marked in-flight — eviction will "
+        "skip it forever"
+    )

tests/test_song_stats_api.py

@@ -452,3 +452,57 @@ def test_award_xp_negative_reversal_clamps_at_zero(server):
     db.award_xp(50, "minigames")
     assert db.award_xp(-50, "minigames") == 0      # exact reversal
     assert db.award_xp(-999, "minigames") == 0     # over-reverse clamps at 0
+
+
+# ── Wall-clock play-time accrual (career hours odometer) ─────────────────────
+
+def test_seconds_accrue_on_scored_and_position_posts(client):
+    r = client.post("/api/stats", json={"filename": "s.archive", "score": 400,
+                                        "accuracy": 0.6, "seconds": 120})
+    assert r.status_code == 200
+    assert r.json()["stats"]["seconds_total"] == pytest.approx(120)
+    # Position-only touch accrues too.
+    r2 = client.post("/api/stats", json={"filename": "s.archive",
+                                         "lastPlayPosition": 12.5, "seconds": 30})
+    assert r2.json()["stats"]["seconds_total"] == pytest.approx(150)
+    # A POST without seconds leaves the total alone.
+    r3 = client.post("/api/stats", json={"filename": "s.archive", "lastPlayPosition": 20.0})
+    assert r3.json()["stats"]["seconds_total"] == pytest.approx(150)
+
+
+def test_seconds_only_post_accrues_without_touching_position(client):
+    client.post("/api/stats", json={"filename": "s.archive", "lastPlayPosition": 42.0})
+    r = client.post("/api/stats", json={"filename": "s.archive", "seconds": 90})
+    assert r.status_code == 200
+    row = r.json()["stats"]
+    assert row["seconds_total"] == pytest.approx(90)
+    # No plays counted, resume position untouched (song:ended must not
+    # overwrite Continue with the end-of-song offset).
+    assert row["plays"] == 0
+    assert row["last_position"] == pytest.approx(42.0)
+    # Recency must come from the seconds-only POST itself — prove it on a
+    # FRESH row (the position touch above already stamps last_played_at,
+    # which would make an assertion here vacuous).
+    r2 = client.post("/api/stats", json={"filename": "fresh.archive", "seconds": 30})
+    assert r2.json()["stats"]["last_played_at"]
+    # Still counts as playing today for the streak.
+    assert r.json()["progress"]["current_streak"] == 1
+
+
+@pytest.mark.parametrize("bad", [True, "soon", -5, 0, 6 * 3600 + 1])
+def test_seconds_validation_rejects_junk(client, bad):
+    r = client.post("/api/stats", json={"filename": "s.archive",
+                                        "lastPlayPosition": 1.0, "seconds": bad})
+    assert r.status_code == 400
+
+
+@pytest.mark.parametrize("token", ["NaN", "Infinity"])
+def test_seconds_validation_rejects_nonfinite(client, token):
+    # json= cannot serialize non-finite floats; python's json.loads (and thus
+    # the server's body parse) accepts the bare tokens, so send raw.
+    r = client.post(
+        "/api/stats",
+        content=f'{{"filename": "s.archive", "lastPlayPosition": 1.0, "seconds": {token}}}',
+        headers={"Content-Type": "application/json"},
+    )
+    assert r.status_code == 400

tests/test_spec_gate.py

@@ -0,0 +1,203 @@
+"""Regression tests for the feedpak spec-conformance gate.
+
+The gate (tools/check_spec_conformance.py) is what keeps the app from drifting
+away from the feedpak spec, so the gate itself must not be weakenable by a
+quiet refactor: these tests pin its load-bearing behaviours — read/write
+classification, the closed allowlist, and the duplicate/malformed-entry
+rejections. If one of these fails, the spec's protection regressed.
+"""
+import importlib.util
+import textwrap
+from pathlib import Path
+
+import pytest
+
+_SPEC_GATE = Path(__file__).resolve().parent.parent / "tools" / "check_spec_conformance.py"
+_spec = importlib.util.spec_from_file_location("check_spec_conformance", _SPEC_GATE)
+gate = importlib.util.module_from_spec(_spec)
+_spec.loader.exec_module(gate)
+
+
+def _touch(tmp_path, source):
+    p = tmp_path / "mod.py"
+    p.write_text(textwrap.dedent(source), encoding="utf-8")
+    return gate.keys_touched(p)
+
+
+# ---------------------------------------------------------------- keys_touched
+
+def test_get_is_a_read(tmp_path):
+    reads, writes = _touch(tmp_path, 'x = manifest.get("title")')
+    assert reads == {"title"} and writes == set()
+
+
+def test_subscript_load_is_a_read(tmp_path):
+    reads, writes = _touch(tmp_path, 'x = manifest["artist"]')
+    assert reads == {"artist"} and writes == set()
+
+
+def test_subscript_store_is_a_write_not_a_read(tmp_path):
+    # The original scan ignored ctx and scored this as a read (lib/songmeta.py
+    # pattern). A regression here reopens the emitted-key blind spot.
+    reads, writes = _touch(tmp_path, 'manifest["year"] = 1999')
+    assert writes == {"year"} and reads == set()
+
+
+def test_setdefault_is_a_write(tmp_path):
+    # lib/gp2notation.py stamps feedpak_version this way; a subscript-only scan
+    # missed it entirely.
+    reads, writes = _touch(tmp_path, 'manifest.setdefault("feedpak_version", "1.2.0")')
+    assert writes == {"feedpak_version"} and reads == set()
+
+
+def test_load_manifest_wrapped_get_is_seen(tmp_path):
+    # lib/enrichment.py idiom: (load_manifest(p) or {}).get("key")
+    reads, writes = _touch(
+        tmp_path, 'rel = (sloppak_mod.load_manifest(p) or {}).get("original_audio")'
+    )
+    assert "original_audio" in reads
+
+
+def test_flow_aware_receiver_any_name(tmp_path):
+    # lib/routers/chart.py binds `m = load_manifest(p) or {}` — a fixed name
+    # list missed it and the module's reads went entirely unscanned. Locals
+    # assigned from load_manifest must be receivers whatever they're called.
+    reads, writes = _touch(
+        tmp_path,
+        """
+        pak_info = sloppak_mod.load_manifest(p) or {}
+        x = pak_info.get("stems")
+        pak_info["genres"] = ["metal"]
+        """,
+    )
+    assert reads == {"stems"} and writes == {"genres"}
+
+
+def test_plain_dict_named_m_is_not_a_receiver(tmp_path):
+    # Flow-awareness must not make every short local a manifest: `m` bound to
+    # something other than load_manifest stays out of the scan.
+    reads, writes = _touch(tmp_path, 'm = {}\nx = m.get("title")')
+    assert reads == set() and writes == set()
+
+
+def test_unrelated_dicts_are_ignored(tmp_path):
+    reads, writes = _touch(tmp_path, 'x = config.get("title"); settings["artist"] = 1')
+    assert reads == set() and writes == set()
+
+
+def test_non_literal_keys_are_ignored(tmp_path):
+    reads, writes = _touch(tmp_path, 'x = manifest.get(key_var); manifest[key_var] = 1')
+    assert reads == set() and writes == set()
+
+
+def test_manifest_key_read_helper_is_seen(tmp_path):
+    # lib/routers/song.py uses this helper for gap-fill proposals. If helpers
+    # are invisible, adding a new literal key through that path bypasses both
+    # key-coverage and readers-complete.
+    reads, writes = _touch(
+        tmp_path,
+        '_gap_fill_manifest_absent(manifest, "album")\n'
+        '_gap_fill_manifest_absent(manifest, dynamic_key)\n',
+    )
+    assert reads == {"album"} and writes == set()
+
+
+# ------------------------------------------------------------ exceptions file
+
+def test_duplicate_exception_key_is_rejected():
+    doc = """
+    exceptions:
+      - key: original_audio
+        issue: https://example.com/1
+      - key: original_audio
+        issue: https://example.com/2
+    """
+    with pytest.raises(SystemExit):
+        gate._parse_exceptions(textwrap.dedent(doc), "test")
+
+
+@pytest.mark.parametrize("doc", [
+    "- just\n- a\n- list\n",                 # list at top level
+    "exceptions: not-a-list\n",              # scalar where list expected
+    "exceptions:\n  - just-a-string\n",      # non-mapping entry
+    "exceptions: [\n",                       # invalid YAML
+])
+def test_malformed_exceptions_fail_legibly(doc):
+    # Malformed shapes must exit with a ::error::, not an AttributeError
+    # traceback — CI output has to say what to fix.
+    with pytest.raises(SystemExit):
+        gate._parse_exceptions(doc, "test")
+
+
+def test_exception_without_issue_is_rejected():
+    # No tracking issue, no exception — entries are debt and debt is tracked.
+    doc = """
+    exceptions:
+      - key: original_audio
+    """
+    with pytest.raises(SystemExit):
+        gate._parse_exceptions(textwrap.dedent(doc), "test")
+
+
+# --------------------------------------------------------- allowlist is CLOSED
+
+def _yml(tmp_path, name, keys):
+    p = tmp_path / name
+    entries = "".join(
+        f"  - key: {k}\n    issue: https://example.com/{k}\n" for k in keys
+    )
+    p.write_text("exceptions:\n" + (entries or " []\n"), encoding="utf-8")
+    return p
+
+
+def test_allowlist_may_not_grow(tmp_path, monkeypatch):
+    # THE core property: adding an entry must fail, or the FEP process has an
+    # in-repo bypass and the gate is a speed bump with a signed excuse note.
+    baseline = _yml(tmp_path, "base.yml", ["original_audio"])
+    current = _yml(tmp_path, "current.yml", ["original_audio", "sneaky_new_key"])
+    monkeypatch.setattr(gate, "EXCEPTIONS_FILE", current)
+    assert gate.check_allowlist_closed(baseline, bootstrap=False) is False
+
+
+def test_allowlist_may_shrink(tmp_path, monkeypatch):
+    baseline = _yml(tmp_path, "base.yml", ["original_audio"])
+    current = _yml(tmp_path, "current.yml", [])
+    monkeypatch.setattr(gate, "EXCEPTIONS_FILE", current)
+    assert gate.check_allowlist_closed(baseline, bootstrap=False) is True
+
+
+def test_allowlist_steady_state_passes(tmp_path, monkeypatch):
+    baseline = _yml(tmp_path, "base.yml", ["original_audio"])
+    current = _yml(tmp_path, "current.yml", ["original_audio"])
+    monkeypatch.setattr(gate, "EXCEPTIONS_FILE", current)
+    assert gate.check_allowlist_closed(baseline, bootstrap=False) is True
+
+
+def test_bootstrap_skips_the_diff(tmp_path, monkeypatch):
+    current = _yml(tmp_path, "current.yml", ["original_audio"])
+    monkeypatch.setattr(gate, "EXCEPTIONS_FILE", current)
+    assert gate.check_allowlist_closed(None, bootstrap=True) is True
+
+
+# ------------------------------------------------------------ readers-complete
+
+def test_readers_list_matches_the_codebase():
+    # If this fails, a module started touching feedpak manifests without being
+    # added to READERS — its keys are going unchecked. Same check CI runs.
+    assert gate.check_readers_complete() is True
+
+
+def test_no_undeclared_keys_beyond_the_grandfathered(monkeypatch):
+    # Every key core touches is either spec-declared or grandfathered with a
+    # tracking issue. New keys go through the FEP process, full stop.
+    reads, writes = set(), set()
+    for rel in gate.READERS:
+        r, w = gate.keys_touched(gate.REPO / rel)
+        reads |= r
+        writes |= w
+    grandfathered = set(gate.load_exceptions())
+    # Not asserting against the spec here (no spec checkout in unit tests) —
+    # asserting the *shape*: the only non-spec keys tolerated are grandfathered,
+    # and today that is exactly {original_audio}.
+    assert grandfathered == {"original_audio"}
+    assert "original_audio" in reads

tests/test_tunings.py

@@ -275,4 +275,7 @@ def test_freqs_to_midis_rejects_garbage():
     from tunings import freqs_to_midis
     assert freqs_to_midis([82.41, 0]) is None          # non-positive
     assert freqs_to_midis([82.41, "x"]) is None        # non-numeric
+    assert freqs_to_midis([float("nan")]) is None      # non-finite (would raise in int(round(...)))
+    assert freqs_to_midis([float("inf")]) is None      # non-finite
+    assert freqs_to_midis([float("-inf")]) is None     # non-finite
     assert freqs_to_midis([]) == []                    # vacuously fine

tools/check_spec_conformance.py

@@ -0,0 +1,537 @@
+#!/usr/bin/env python3
+"""feedpak spec-conformance gate.
+
+feedpak is an open, versioned format with its own normative spec, JSON Schemas,
+and reference validator (https://github.com/got-feedback/feedpak-spec). That
+makes the spec a contract with everyone outside this repo: third-party packers,
+converters, and players build against it. When core reads a manifest key the
+spec never defined, the contract quietly breaks — a spec-compliant pack stops
+being a fully-working pack, and the format's real definition migrates into our
+source tree. See #933 for the instance that motivated this gate.
+
+We cannot mechanically prove core *interprets* a key the way the spec means. We
+can prove four surface properties, and those cover the drift that actually
+happens:
+
+  1. key-coverage    — every manifest key core reads OR WRITES is declared by the
+                       spec. (Guarded by check_readers_complete(), so the list of
+                       scanned modules cannot quietly fall behind the codebase.)
+  2. allowlist-closed— feedpak-spec-exceptions.yml never grows. It grandfathers
+                       keys that predate this gate; it is not a way to merge a
+                       new one. The only route for a new key is the FEP process.
+  3. forward         — core ingests the spec's own example packs.
+  4. reverse         — packs committed here satisfy the spec's reference validator.
+
+Dev/CI tooling only: never imported on the serve or Docker path (constitution
+Principle I — same category as scripts/build-tailwind.sh). `jsonschema` is
+therefore a CI-only dependency, not a runtime requirement.
+
+Usage:
+    python tools/check_spec_conformance.py --spec <path-to-feedpak-spec-checkout>
+
+Exit status is 0 only when every layer passes.
+"""
+from __future__ import annotations
+
+import argparse
+import ast
+import json
+import re
+import subprocess
+import sys
+import tempfile
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parent.parent
+
+# Modules that read or write a feedpak manifest dict. Explicit rather than
+# globbed, because `manifest` is an overloaded name in this codebase: the
+# loose-folder format (lib/loosefolder.py) and the diagnostics bundle
+# (lib/diagnostics_bundle.py) both have their own unrelated `manifest`, and
+# scanning those would flag *their* keys as feedpak drift.
+#
+# A hand-maintained list is itself a blind spot, so check_readers_complete()
+# below re-derives the set and fails if this list has fallen behind. A missing
+# file here is a hard error too, so a rename cannot silently disable the scan.
+READERS = [
+    "lib/sloppak.py",
+    "lib/enrichment.py",
+    "lib/songmeta.py",
+    "lib/gp2notation.py",        # rewrites manifest.yaml; stamps feedpak_version
+    "lib/routers/ws_highway.py", # reads `authors` off a feedpak manifest
+    "lib/routers/chart.py",      # Get-info panel: binds `m = load_manifest(...)`
+    "lib/routers/song.py",       # enrichment gap-fill: reads the manifest directly
+]
+
+# Where check_readers_complete() looks for modules READERS may have missed.
+READER_SEARCH = ["lib/**/*.py", "server.py"]
+
+# A module is handling a *feedpak* manifest (rather than some other manifest) if
+# it shows one of these signals. lib/loosefolder.py and lib/diagnostics_bundle.py
+# score zero on all of them, which is what keeps their keys out of the scan.
+FEEDPAK_SIGNALS = re.compile(r"import sloppak|from sloppak|load_manifest|manifest\.yaml|feedpak")
+
+# Locals assumed to hold a manifest dict by NAME. This is only the fallback for
+# manifests that arrive as function parameters (ws_highway's `manifest` arg);
+# locals ASSIGNED from load_manifest(...) are discovered flow-aware in
+# keys_touched(), whatever they are called — chart.py's `m` taught us that a
+# name list alone silently misses real readers.
+MANIFEST_VARS = {"manifest", "mf"}
+
+# Helper functions that take `(manifest, "literal_key", ...)` and read the
+# manifest for that key. Keep this narrow: only helpers whose first argument is
+# the manifest dict and whose second argument is a top-level manifest key belong
+# here.
+MANIFEST_KEY_READ_HELPERS = {"_gap_fill_manifest_absent"}
+
+# Packs committed to this repo, checked against the spec's reference validator.
+PACK_GLOBS = ["content/starter/*.feedpak", "docs/**/*.sloppak", "docs/**/*.feedpak"]
+
+EXCEPTIONS_FILE = REPO / "feedpak-spec-exceptions.yml"
+
+# How a new manifest key gets into core. There is no in-repo shortcut, by design:
+# the spec's own governance says "a change is not part of the format until it
+# lands here", and the FEP process is how it lands.
+FEP = (
+    "New manifest keys go through the feedpak Enhancement Proposal process "
+    "(https://github.com/got-feedback/feedpak-spec/blob/main/CONTRIBUTING.md): land a PR on "
+    "feedpak-spec that updates the normative spec, the JSON Schemas, an example, and the "
+    "changelog together — then re-run this PR's checks; the gate verifies against the "
+    "spec's HEAD, so once your key is in the spec, this PR goes green. It matters beyond "
+    "this PR: the whole repo is checked against the living spec, so non-conformance that "
+    "slips in shows up as red CI on every teammate's PR until it's resolved — sorting it "
+    "out here keeps everyone else unblocked."
+)
+
+
+def _fail(msg: str) -> None:
+    print(f"::error::{msg}")
+
+
+def _manifest_locals(tree: ast.AST) -> set[str]:
+    """Names of locals assigned from `load_manifest(...)` anywhere in `tree`.
+
+    Flow-aware receiver discovery: chart.py binds `m = load_manifest(p) or {}`,
+    and a fixed name list (`manifest`, `mf`) silently missed it — the module's
+    reads went entirely unscanned. Whatever the local is called, an assignment
+    whose right-hand side mentions load_manifest marks it as a manifest dict.
+    """
+    names: set[str] = set()
+    for node in ast.walk(tree):
+        if not isinstance(node, (ast.Assign, ast.AnnAssign)):
+            continue
+        try:
+            rhs = ast.unparse(node.value) if node.value else ""
+        except Exception:
+            continue
+        if "load_manifest" not in rhs:
+            continue
+        targets = node.targets if isinstance(node, ast.Assign) else [node.target]
+        for t in targets:
+            if isinstance(t, ast.Name):
+                names.add(t.id)
+    return names
+
+
+def _is_manifest_receiver(node: ast.expr, receivers: set[str]) -> bool:
+    """True when `node` evaluates to a manifest dict.
+
+    Covers named receivers (fixed names + flow-discovered locals) plus the
+    inline wrapped form used in lib/enrichment.py:
+    `(sloppak_mod.load_manifest(p) or {}).get("key")`.
+    """
+    if isinstance(node, ast.Name) and node.id in receivers:
+        return True
+    try:
+        src = ast.unparse(node)
+    except Exception:
+        return False
+    return "load_manifest" in src
+
+
+def keys_touched(path: Path) -> tuple[set[str], set[str]]:
+    """Literal top-level manifest keys `path` reads and writes, separately.
+
+    Writes matter as much as reads: `manifest["k"] = v` means core *emits* `k`
+    into a pack it ships, so an undeclared key there puts non-spec surface into
+    the wild — the same drift, pointed outward. `manifest["k"]` in a subscript
+    is a read only when its context is a Load; an `ast.walk` that ignores `ctx`
+    would score `manifest["year"] = ...` (lib/songmeta.py) as a read.
+    """
+    reads: set[str] = set()
+    writes: set[str] = set()
+    tree = ast.parse(path.read_text(encoding="utf-8"), filename=str(path))
+    receivers = MANIFEST_VARS | _manifest_locals(tree)
+    for node in ast.walk(tree):
+        if (
+            isinstance(node, ast.Call)
+            and isinstance(node.func, ast.Attribute)
+            # `setdefault("k", v)` writes k when absent — lib/gp2notation.py
+            # stamps feedpak_version that way, and a subscript-only scan misses
+            # it entirely, letting an emitted key slip past the gate.
+            and node.func.attr in ("get", "setdefault")
+            and _is_manifest_receiver(node.func.value, receivers)
+            and node.args
+            and isinstance(node.args[0], ast.Constant)
+            and isinstance(node.args[0].value, str)
+        ):
+            bucket = writes if node.func.attr == "setdefault" else reads
+            bucket.add(node.args[0].value)
+        elif (
+            isinstance(node, ast.Call)
+            and isinstance(node.func, ast.Name)
+            and node.func.id in MANIFEST_KEY_READ_HELPERS
+            and len(node.args) >= 2
+            and _is_manifest_receiver(node.args[0], receivers)
+            and isinstance(node.args[1], ast.Constant)
+            and isinstance(node.args[1].value, str)
+        ):
+            reads.add(node.args[1].value)
+        elif (
+            isinstance(node, ast.Subscript)
+            and _is_manifest_receiver(node.value, receivers)
+            and isinstance(node.slice, ast.Constant)
+            and isinstance(node.slice.value, str)
+        ):
+            target = writes if isinstance(node.ctx, ast.Store) else reads
+            target.add(node.slice.value)
+    return reads, writes
+
+
+def _parse_exceptions(text: str, origin: str) -> dict[str, str]:
+    """Parse an exceptions document into {key: tracking issue}."""
+    import yaml  # runtime dep (PyYAML is already in requirements.txt)
+
+    try:
+        data = yaml.safe_load(text) or {}
+    except yaml.YAMLError as e:
+        _fail(f"{origin}: not valid YAML — {e}")
+        sys.exit(1)
+    # A malformed shape (list/string at top level, non-mapping entry) must fail
+    # with a CI-legible error, not an AttributeError traceback.
+    if not isinstance(data, dict):
+        _fail(f"{origin}: top level must be a mapping with an 'exceptions' list, got {type(data).__name__}")
+        sys.exit(1)
+    entries = data.get("exceptions") or []
+    if not isinstance(entries, list):
+        _fail(f"{origin}: 'exceptions' must be a list, got {type(entries).__name__}")
+        sys.exit(1)
+    out: dict[str, str] = {}
+    for entry in entries:
+        if not isinstance(entry, dict):
+            _fail(f"{origin}: each exception must be a mapping with 'key' and 'issue', got {type(entry).__name__}")
+            sys.exit(1)
+        key, issue = entry.get("key"), entry.get("issue")
+        if not key or not issue:
+            _fail(f"{origin}: every exception needs both 'key' and 'issue'")
+            sys.exit(1)
+        # A duplicate would silently take the last issue link, quietly retargeting
+        # the debt this file exists to track. Fail instead.
+        if key in out:
+            _fail(
+                f"{origin}: '{key}' is listed more than once. "
+                f"Keep one entry per key so the tracking issue is unambiguous."
+            )
+            sys.exit(1)
+        out[key] = issue
+    return out
+
+
+def load_exceptions() -> dict[str, str]:
+    """Map of grandfathered key -> tracking issue URL, as of this working tree."""
+    if not EXCEPTIONS_FILE.exists():
+        return {}
+    return _parse_exceptions(
+        EXCEPTIONS_FILE.read_text(encoding="utf-8"), EXCEPTIONS_FILE.name
+    )
+
+
+def check_allowlist_closed(baseline: Path | None, bootstrap: bool) -> bool:
+    """The allowlist is CLOSED: it may shrink, never grow.
+
+    `feedpak-spec-exceptions.yml` grandfathers keys that predate this gate. It is
+    not a way to merge a new one. Without this check the gate would be a speed
+    bump with a signed excuse note — anyone could append an entry and route
+    around the FEP process from inside this repo, which is exactly the drift that
+    produced #933.
+
+    So: removing an entry is fine (that's the debt being paid down); adding one
+    fails the build, and the error points at the FEP process instead.
+    """
+    if bootstrap:
+        print("  allowlist-closed: bootstrapping (no baseline on the base branch) — skipped")
+        return True
+    if baseline is None:
+        print("  allowlist-closed: no baseline supplied (local run) — skipped")
+        return True
+
+    if not baseline.is_file():
+        _fail(
+            f"--baseline-exceptions {baseline} does not exist. CI derives this from the base "
+            f"branch; for a local run, omit the flag to skip the allowlist diff."
+        )
+        return False
+    base_keys = set(
+        _parse_exceptions(baseline.read_text(encoding="utf-8"), f"{EXCEPTIONS_FILE.name} (base)")
+    )
+    now_keys = set(load_exceptions())
+    added = sorted(now_keys - base_keys)
+    removed = sorted(base_keys - now_keys)
+
+    for key in added:
+        _fail(
+            f"{EXCEPTIONS_FILE.name}: this PR adds an exception for '{key}', and the allowlist "
+            f"can't take new entries — it only grandfathers keys that predate the gate. {FEP}"
+        )
+    if removed:
+        print(f"  allowlist shrank (debt paid down): {', '.join(removed)}")
+    print(f"  allowlist-closed: {'FAILED' if added else 'OK'}")
+    return not added
+
+
+def check_readers_complete() -> bool:
+    """READERS must not fall behind the codebase.
+
+    The key-coverage scan is only as good as the list of modules it scans, and a
+    hand-maintained list rots: `lib/routers/ws_highway.py` and
+    `lib/gp2notation.py` both touched feedpak manifests for a while without being
+    on it. So re-derive the set — any module that both touches manifest keys and
+    shows a feedpak signal must be listed — and fail if one is missing.
+
+    This is a guard on the gate itself, not on the format.
+    """
+    listed = set(READERS)
+    missing: list[str] = []
+    for pattern in READER_SEARCH:
+        for path in sorted(REPO.glob(pattern)):
+            rel = path.relative_to(REPO).as_posix()
+            if rel in listed:
+                continue
+            src = path.read_text(encoding="utf-8", errors="replace")
+            if not FEEDPAK_SIGNALS.search(src):
+                continue
+            # Same scanner the coverage check uses — a separate "does it touch
+            # keys" regex diverged from it once already (`m = load_manifest(...)`
+            # in chart.py matched neither `manifest` nor `mf`, so the module
+            # went unlisted AND unscanned). One detector, one truth.
+            try:
+                reads, writes = keys_touched(path)
+            except SyntaxError:
+                continue
+            if reads or writes:
+                missing.append(rel)
+
+    for rel in missing:
+        _fail(
+            f"{rel} touches feedpak manifest keys but is not in READERS "
+            f"({Path(__file__).name}) — its keys are going unchecked. Add it."
+        )
+    print(f"  scanning {len(listed)} modules; readers-complete: {'FAILED' if missing else 'OK'}")
+    return not missing
+
+
+def check_key_coverage(spec: Path) -> bool:
+    """Layer 1 — core must not read or write a manifest key the spec does not declare."""
+    schema = json.loads((spec / "schemas" / "manifest.schema.json").read_text(encoding="utf-8"))
+    declared = set(schema.get("properties") or {})
+    if not declared:
+        _fail("spec manifest.schema.json declares no properties — wrong path or bad checkout?")
+        return False
+
+    reads: set[str] = set()
+    writes: set[str] = set()
+    for rel in READERS:
+        path = REPO / rel
+        if not path.exists():
+            _fail(f"reader {rel} not found — was it renamed? Update READERS in {Path(__file__).name}.")
+            return False
+        try:
+            r, w = keys_touched(path)
+        except SyntaxError as e:
+            # A module that doesn't parse can't be scanned — but it also can't
+            # pass pytest, so this is belt-and-braces for a CI-legible message
+            # rather than a traceback if this job runs first.
+            _fail(f"could not scan {rel}: {e}")
+            return False
+        reads |= r
+        writes |= w
+
+    exceptions = load_exceptions()
+    ok = True
+
+    def _undeclared(keys: set[str]) -> list[str]:
+        return sorted((keys - declared) - set(exceptions))
+
+    for key in _undeclared(reads):
+        _fail(f"core reads manifest key '{key}', which the feedpak spec does not define. {FEP}")
+        ok = False
+
+    for key in _undeclared(writes):
+        _fail(
+            f"core writes manifest key '{key}', which the feedpak spec does not define — that "
+            f"puts non-spec surface into every pack we emit. {FEP}"
+        )
+        ok = False
+
+    # A stale exception is its own bug: it means the spec caught up and nobody
+    # cleaned up, so the allowlist slowly becomes a place drift hides.
+    touched = reads | writes
+    for key, issue in exceptions.items():
+        if key in declared:
+            _fail(
+                f"'{key}' is listed in {EXCEPTIONS_FILE.name} but the spec now declares it. "
+                f"Remove the exception and close {issue}."
+            )
+            ok = False
+        elif key not in touched:
+            _fail(
+                f"'{key}' is listed in {EXCEPTIONS_FILE.name} but core no longer reads or writes "
+                f"it. Remove the exception."
+            )
+            ok = False
+
+    print(f"  spec declares {len(declared)} keys; core reads {len(reads)}, writes {len(writes)}")
+    if exceptions:
+        print(f"  grandfathered (tracked debt): {', '.join(sorted(exceptions))}")
+    print(f"  key-coverage: {'OK' if ok else 'FAILED'}")
+    return ok
+
+
+def check_forward(spec: Path) -> bool:
+    """Layer 3 — core must ingest every example pack the spec ships."""
+    examples_dir = spec / "examples"
+    if not examples_dir.is_dir():
+        _fail(f"{examples_dir} is missing — wrong path or bad checkout?")
+        return False
+    # rglob, not iterdir: the contract is "every example pack the spec ships", so
+    # a pack nested under examples/<group>/ must not slip through.
+    #
+    # Deliberately NOT filtered by is_file(): a feedpak is dual-form — a zip
+    # (`foo.feedpak`) *or* a directory (`foo.feedpak/`) — and the spec's own
+    # examples ship as directories today. An is_file() guard here would silently
+    # match zero packs. Matching on the suffix covers both forms, and rglob does
+    # not smuggle in a pack's innards because files inside a pack don't carry a
+    # pack suffix.
+    examples = sorted(
+        p for p in examples_dir.rglob("*")
+        if p.suffix in (".feedpak", ".sloppak")
+    )
+    if not examples:
+        _fail("spec ships no example packs — wrong path or bad checkout?")
+        return False
+
+    sys.path.insert(0, str(REPO / "lib"))
+    try:
+        import sloppak  # noqa: E402  (path must be set first — flat imports, no package)
+    except Exception as e:
+        _fail(
+            f"could not import core's sloppak loader ({type(e).__name__}: {e}). "
+            f"Are requirements.txt deps installed?"
+        )
+        return False
+
+    ok = True
+    with tempfile.TemporaryDirectory() as tmp:
+        cache = Path(tmp)
+        for pack in examples:
+            try:
+                loaded = sloppak.load_song(pack.name, pack.parent, cache)
+            except Exception as e:
+                _fail(
+                    f"core failed to load the spec's own example pack {pack.name}: "
+                    f"{type(e).__name__}: {e}. A spec-valid pack must load."
+                )
+                ok = False
+                continue
+            if not loaded.song.arrangements:
+                _fail(f"core loaded {pack.name} but found no arrangements")
+                ok = False
+                continue
+            print(f"  loaded {pack.name}: {len(loaded.song.arrangements)} arrangement(s)")
+    print(f"  forward: {'OK' if ok else 'FAILED'}")
+    return ok
+
+
+def check_reverse(spec: Path) -> bool:
+    """Layer 4 — packs committed here must pass the spec's reference validator."""
+    packs = sorted({p for g in PACK_GLOBS for p in REPO.glob(g)})
+    if not packs:
+        print("  reverse: no committed packs — skipped")
+        return True
+
+    try:
+        proc = subprocess.run(
+            [sys.executable, str(spec / "tools" / "validate.py"), *[str(p) for p in packs]],
+            capture_output=True,
+            text=True,
+            # The validator takes seconds for all committed packs; a pathological
+            # pack or validator bug must fail the job, not hang the runner until
+            # the Actions-level timeout.
+            timeout=300,
+        )
+    except subprocess.TimeoutExpired:
+        _fail("the spec's reference validator did not finish within 300s — pathological pack or validator bug?")
+        print("  reverse: FAILED")
+        return False
+    sys.stdout.write("".join(f"  {ln}\n" for ln in proc.stdout.splitlines() if ln.strip()))
+    if proc.returncode != 0:
+        _fail(
+            "a pack committed to this repo does not satisfy the feedpak spec "
+            "(see the reference validator output above)."
+        )
+        if proc.stderr.strip():
+            sys.stderr.write(proc.stderr)
+    print(f"  reverse: {'OK' if proc.returncode == 0 else 'FAILED'}")
+    return proc.returncode == 0
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser(description=__doc__.splitlines()[0])
+    ap.add_argument(
+        "--spec",
+        required=True,
+        type=Path,
+        help="path to a feedpak-spec checkout (CI checks out the spec repo's HEAD)",
+    )
+    ap.add_argument(
+        "--baseline-exceptions",
+        type=Path,
+        help="the exceptions file as it exists on the base branch. Supplied by CI so the "
+             "allowlist can be proven to have not grown. Omit for a local run.",
+    )
+    ap.add_argument(
+        "--bootstrap-allowlist",
+        action="store_true",
+        help="the base branch has no exceptions file yet (this PR introduces the gate), so "
+             "there is nothing to diff against. CI passes this only in that case.",
+    )
+    args = ap.parse_args()
+
+    spec = args.spec.resolve()
+    if not (spec / "schemas" / "manifest.schema.json").exists():
+        _fail(f"{spec} does not look like a feedpak-spec checkout")
+        return 1
+
+    print("[1/4] key-coverage — core reads/writes only keys the spec declares")
+    # Both run, always: a stale READERS list and an undeclared key are separate
+    # failures, and reporting only the first would hide the second. Hence two
+    # calls and an explicit `and` over the results, not a short-circuiting one.
+    readers_ok = check_readers_complete()
+    coverage_ok = check_key_coverage(spec)
+    ok1 = readers_ok and coverage_ok
+    print("[2/4] allowlist-closed — the grandfather list may shrink, never grow")
+    ok2 = check_allowlist_closed(args.baseline_exceptions, args.bootstrap_allowlist)
+    print("[3/4] forward — core ingests the spec's example packs")
+    ok3 = check_forward(spec)
+    print("[4/4] reverse — committed packs satisfy the reference validator")
+    ok4 = check_reverse(spec)
+
+    if ok1 and ok2 and ok3 and ok4:
+        print("\nfeedpak spec conformance: OK")
+        return 0
+    print("\nfeedpak spec conformance: FAILED")
+    return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())

tools/migrate_full_mix_stem.py

@@ -0,0 +1,445 @@
+#!/usr/bin/env python3
+"""Migrate packs off the deprecated `original_audio:` key — the full mix is a stem.
+
+Before feedpak 1.15.0 reserved the stem id `full`, spec §5.3 said the mixdown was
+"commonly replaced" by the per-instrument stems when a pack was split — so after
+separation it had nowhere to live. This repo worked around that by inventing a
+top-level `original_audio:` manifest key pointing at a parallel `original/`
+directory (#583). The key was never in the spec, and #933 removed core's
+dependence on it: the mixdown is a stem, and its id is `full`.
+
+This rewrites a pack into the shape the spec now defines:
+
+    original/full.ogg                  ->  stems/full.ogg          (entry moved)
+    original_audio: original/full.ogg  ->  stems: [{id: full, file: stems/full.ogg,
+                                                    default: 'off'}, ...]
+
+`default: 'off'` is what makes the retained mixdown safe: a reader that honours
+`default` (normative since feedpak 1.0.0) will not play it on open, so it never
+doubles the mix even in a reader that predates the reserved id.
+
+Nothing else in the pack is touched — every other key, file and stem is preserved
+verbatim, and `feedpak_version` is stamped to the version the result conforms to.
+
+The rewrite is atomic per pack: a new archive is built beside the original and
+renamed over it only on success, so an interrupted run leaves every pack either
+fully migrated or untouched — never truncated.
+
+Idempotent: a pack that already carries a `full` stem and no `original_audio:` is
+reported as `skip` and left alone, so a partial run can simply be re-run.
+
+Usage:
+    python tools/migrate_full_mix_stem.py --dry-run /path/to/packs   # report only
+    python tools/migrate_full_mix_stem.py /path/to/packs             # migrate
+    python tools/migrate_full_mix_stem.py --verify /path/to/packs    # check results
+
+Exit status is 0 only when every pack ended up in the migrated shape (or was
+already there).
+"""
+from __future__ import annotations
+
+import argparse
+import os
+import shutil
+import sys
+import tempfile
+import threading
+import time
+import zipfile
+from concurrent.futures import ThreadPoolExecutor, as_completed
+from pathlib import Path
+
+import yaml
+
+# The version this migration brings a pack up to: the one that reserved `full`.
+TARGET_FEEDPAK_VERSION = "1.15.0"
+FULL_MIX_STEM_ID = "full"
+LEGACY_KEY = "original_audio"
+# Where the mixdown lands. §2.1's conventional layout — readers resolve through
+# the manifest and never care about the path, but a pack that says `stems/` and
+# means it is the one a human can read.
+CANONICAL_FULL_MIX_PATH = "stems/full.ogg"
+
+PACK_EXTS = (".feedpak", ".sloppak")
+
+
+class Skip(Exception):
+    """Pack needs no migration."""
+
+
+def is_safe_relpath(rel: str) -> bool:
+    """True when `rel` is a manifest path the spec allows (§2.2 rule 2).
+
+    POSIX-style relative: forward slashes, no leading `/`, no `..` segments, no
+    empty segments, no colon (which excludes drive letters and NTFS alternate
+    data streams), no backslashes.
+
+    This is a TRUST BOUNDARY, not a tidiness check. Core's loader refuses a
+    full-mix path that escapes the pack and reports the pack as having no full
+    mix — the audio is inert. A migration that moved such an entry into
+    `stems/full.ogg` would take content the reader deliberately rejected and
+    hand it back as a valid, playable stem. So a pack like this is reported, not
+    migrated.
+    """
+    if not rel or rel.startswith("/") or "\\" in rel or ":" in rel:
+        return False
+    parts = rel.split("/")
+    return all(p and p != ".." for p in parts)
+
+
+def plan_manifest(manifest: dict) -> tuple[dict, str]:
+    """Return (new_manifest, relpath_of_audio_to_move); "" = no file needs moving.
+
+    Raises Skip when the pack needs no migration. Pure — no I/O — so the part
+    with the decisions in it is testable without building archives.
+    """
+    raw_stems = manifest.get("stems")
+    stems: list = raw_stems if isinstance(raw_stems, list) else []
+    has_full_stem = any(
+        isinstance(s, dict) and str(s.get("id", "")) == FULL_MIX_STEM_ID for s in stems
+    )
+    legacy_rel = manifest.get(LEGACY_KEY)
+    legacy_rel = legacy_rel.strip() if isinstance(legacy_rel, str) else ""
+
+    if not legacy_rel:
+        # Nothing invented to undo: either the pack already keeps its mixdown as
+        # the `full` stem, or it never carried one.
+        raise Skip("already migrated" if has_full_stem else "no original_audio key")
+
+    if has_full_stem:
+        # The mixdown is already a stem and the dead key merely lingers beside it.
+        # Drop the key; move nothing. But do NOT trust its `default`: a mixdown
+        # left enabled beside instrument stems is the double-audio hazard this
+        # migration exists to remove, and a reader that honours `default` would
+        # play the whole song on top of the stems on open. Force it off — unless
+        # `full` is the only stem, in which case it IS the audio.
+        others = [
+            s
+            for s in stems
+            if isinstance(s, dict) and str(s.get("id", "")) != FULL_MIX_STEM_ID
+        ]
+        new_stems = []
+        for s in stems:
+            if isinstance(s, dict) and str(s.get("id", "")) == FULL_MIX_STEM_ID and others:
+                s = {**s, "default": "off"}
+            new_stems.append(s)
+        to_move = ""
+    else:
+        # `default` decides whether a reader plays this on open, and that is the
+        # whole safety margin: alongside per-instrument stems the mixdown must be
+        # OFF (a reader that sums the list would otherwise double the song), but
+        # when it is the pack's only stem it IS the audio and must be ON.
+        entry = {
+            "id": FULL_MIX_STEM_ID,
+            "file": CANONICAL_FULL_MIX_PATH,
+            "default": "off" if stems else "on",
+        }
+        # First in the list, matching the spec's §5.3 example.
+        new_stems = [entry, *stems]
+        # If the key already pointed at the canonical path, only the manifest is wrong.
+        to_move = "" if legacy_rel == CANONICAL_FULL_MIX_PATH else legacy_rel
+
+    out: dict = {}
+    for k, v in manifest.items():
+        if k == LEGACY_KEY:
+            continue  # the invented key disappears
+        out[k] = new_stems if k == "stems" else v
+    out.setdefault("stems", new_stems)  # a pack that had no stems list gets one
+    out["feedpak_version"] = TARGET_FEEDPAK_VERSION
+    return out, to_move
+
+
+def migrate_zip(path: Path, dry_run: bool) -> str:
+    """Rewrite one zipped pack in place. Returns a one-word status."""
+    with zipfile.ZipFile(path) as zf:
+        try:
+            raw = zf.read("manifest.yaml")
+        except KeyError:
+            return "no-manifest"
+        manifest = yaml.safe_load(raw) or {}
+        try:
+            new_manifest, old_rel = plan_manifest(manifest)
+        except Skip:
+            return "skip"
+        names = set(zf.namelist())
+        if old_rel:
+            if not is_safe_relpath(old_rel):
+                # Core refuses this path and plays no full mix for the pack. Do
+                # not launder it into a valid stem — see is_safe_relpath().
+                return "unsafe-path"
+            if old_rel not in names:
+                # The key points at audio that isn't in the archive. Core already
+                # treats that as "no full mix"; migrating would fabricate a stem
+                # entry for a file that does not exist and break every reader.
+                return "missing-audio"
+            if CANONICAL_FULL_MIX_PATH in names:
+                return "target-occupied"
+        else:
+            # Manifest-only rewrite (a stale key beside a mixdown that is already
+            # a stem, or a key that already pointed at the canonical path). Check
+            # the file the resulting `full` stem will actually NAME — not the
+            # canonical path, which an already-migrated pack is free not to use:
+            # §2.2 says readers resolve through the manifest, so a valid pack may
+            # keep its mixdown anywhere.
+            full_file = next(
+                (
+                    s.get("file")
+                    for s in new_manifest.get("stems", [])
+                    if isinstance(s, dict) and str(s.get("id", "")) == FULL_MIX_STEM_ID
+                ),
+                None,
+            )
+            if full_file not in names:
+                return "missing-audio"
+        if dry_run:
+            return "would-migrate"
+
+        # Build the replacement beside the original, on the same filesystem, so
+        # the final rename is atomic and an interrupted run can't truncate a pack.
+        tmp_fd, tmp_name = tempfile.mkstemp(
+            dir=str(path.parent), prefix=f".{path.name}.", suffix=".tmp"
+        )
+        os.close(tmp_fd)
+        tmp_path = Path(tmp_name)
+        try:
+            with zipfile.ZipFile(tmp_path, "w", zipfile.ZIP_DEFLATED) as out:
+                for item in zf.infolist():
+                    if item.filename == "manifest.yaml":
+                        out.writestr(
+                            item,
+                            yaml.safe_dump(
+                                new_manifest, sort_keys=False, allow_unicode=True
+                            ),
+                        )
+                        continue
+                    data = zf.read(item.filename)
+                    if old_rel and item.filename == old_rel:
+                        # Same bytes, same compression, new name: the mixdown moves
+                        # from original/ into stems/ where the format says audio goes.
+                        moved = zipfile.ZipInfo(
+                            CANONICAL_FULL_MIX_PATH, date_time=item.date_time
+                        )
+                        moved.compress_type = item.compress_type
+                        moved.external_attr = item.external_attr
+                        out.writestr(moved, data)
+                        continue
+                    out.writestr(item, data)
+        except BaseException:
+            tmp_path.unlink(missing_ok=True)
+            raise
+    shutil.copystat(path, tmp_path)
+    os.replace(tmp_path, path)  # atomic
+    return "migrated"
+
+
+def verify_zip(path: Path) -> str:
+    """Confirm a pack is in the migrated shape and its mixdown is really there."""
+    with zipfile.ZipFile(path) as zf:
+        try:
+            manifest = yaml.safe_load(zf.read("manifest.yaml")) or {}
+        except KeyError:
+            return "no-manifest"
+        if LEGACY_KEY in manifest:
+            return "still-has-key"
+        stems = manifest.get("stems") or []
+        full = next(
+            (
+                s
+                for s in stems
+                if isinstance(s, dict) and str(s.get("id", "")) == FULL_MIX_STEM_ID
+            ),
+            None,
+        )
+        if full is None:
+            return "no-full-stem"
+        if full.get("file") not in set(zf.namelist()):
+            return "full-stem-missing-file"
+        # A retained mixdown that plays on open would double the mix in any reader
+        # that sums the stem list — the whole hazard this migration must not create.
+        # Beside instrument stems, `full` MUST carry an explicit, normalized "off":
+        #   - core (lib/sloppak.py) defaults an ABSENT `default` to True (ON) and
+        #     treats an empty / unrecognized string as ON, so a missing or blank
+        #     default is not merely non-canonical — core would play the mixdown on
+        #     open, doubling the song. It is the exact hazard, not a lesser one.
+        #   - the migrator always writes the literal "off", so requiring it also
+        #     certifies the pack is in the shape this tool produces — the most
+        #     portable spelling, understood even by a reader that only knows
+        #     "on"/"off" and would choke on a boolean or `false`/`0`/`no`.
+        # So: `on`-ish values are reported as actively-playing; everything that is
+        # not a normalized "off" (missing, empty, boolean, `false`/`no`/`0`,
+        # malformed) is reported as an unsafe/non-canonical default.
+        if len(stems) > 1:
+            default = str(full.get("default", "")).strip().lower()
+            if default in ("true", "on", "yes", "1"):
+                return "full-stem-default-on"
+            if default != "off":
+                return "full-stem-default-not-off"
+    return "ok"
+
+
+def migrate_pack(path: Path, dry_run: bool) -> str:
+    """Dispatch by pack form. ZIP-file packs are rewritten in place; directory
+    (authoring) packs are REPORTED, not rewritten.
+
+    A single-file pack is replaced atomically — a fully-built temp archive
+    swapped in with one os.replace(), so an interrupted run leaves it either
+    fully migrated or untouched. A directory can't be swapped that way (no
+    atomic replace of a populated directory), so an in-place rewrite could leave
+    an authoring pack half-migrated. Rather than risk that, directory packs are
+    surfaced as `dir-form-unsupported` (a problem status, so the run's exit code
+    and summary flag them) for the operator to re-pack or migrate as a `.feedpak`.
+    """
+    if path.is_dir():
+        return "dir-form-unsupported"
+    return migrate_zip(path, dry_run)
+
+
+def verify_pack(path: Path) -> str:
+    """Verify a pack; directory (authoring) packs are reported, see migrate_pack."""
+    if path.is_dir():
+        return "dir-form-unsupported"
+    return verify_zip(path)
+
+
+def iter_packs(root: Path):
+    """Yield every pack under `root`. A pack is a suffix-named ZIP FILE or a
+    suffix-named DIRECTORY (the authoring form) — both are discovered so a
+    directory-form pack is never silently walked past. A directory pack is
+    yielded whole, not descended into: its `stems/` and `arrangements/` are pack
+    contents, not packs. (migrate/verify then report directory packs rather than
+    rewriting them in place — see migrate_pack.)"""
+    if root.is_file():
+        yield root
+        return
+    # A directory whose OWN name is a pack suffix is a single directory-form
+    # pack passed directly, not a tree of packs to search.
+    if root.name.endswith(PACK_EXTS):
+        yield root
+        return
+    for dirpath, dirnames, filenames in os.walk(root):
+        for fn in sorted(filenames):
+            if fn.endswith(PACK_EXTS):
+                yield Path(dirpath) / fn
+        for dn in sorted(dn for dn in dirnames if dn.endswith(PACK_EXTS)):
+            yield Path(dirpath) / dn
+        # Don't descend INTO a pack directory — its contents aren't packs.
+        dirnames[:] = [dn for dn in dirnames if not dn.endswith(PACK_EXTS)]
+
+
+def main(argv: list[str] | None = None) -> int:
+    ap = argparse.ArgumentParser(description=__doc__.splitlines()[0])
+    ap.add_argument("root", type=Path, help="pack, or directory of packs")
+    ap.add_argument("--dry-run", action="store_true", help="report, change nothing")
+    ap.add_argument("--verify", action="store_true", help="check the migrated shape")
+    ap.add_argument("--jobs", type=int, default=8, help="parallel packs (default 8)")
+    args = ap.parse_args(argv)
+
+    if not args.root.exists():
+        print(f"error: {args.root} does not exist", file=sys.stderr)
+        return 2
+
+    packs = list(iter_packs(args.root))
+    if not packs:
+        print(f"no packs found under {args.root}", file=sys.stderr)
+        return 2
+
+    action = verify_pack if args.verify else (lambda p: migrate_pack(p, args.dry_run))
+
+    def work(pack: Path) -> str:
+        """Never raise. One unreadable pack must not kill a 50,000-pack run.
+
+        A library this size has damage in it — a truncated download, an archive
+        left half-written by an interrupted converter. Letting that propagate
+        aborts the whole job partway through and throws away the summary, which
+        is exactly when you most need to know what happened. Report it as a
+        problem status instead: the pack is untouched, the run continues, and the
+        final report names it.
+        """
+        try:
+            return action(pack)
+        except zipfile.BadZipFile:
+            return "corrupt-zip"
+        except OSError as e:
+            return f"io-error ({e.__class__.__name__})"
+        except Exception as e:  # malformed YAML, unexpected manifest shape, …
+            return f"error ({e.__class__.__name__})"
+    counts: dict[str, int] = {}
+    problems: list[tuple[str, Path]] = []
+    # A real run rewrites every archive under `root` — tens of thousands of packs
+    # and hundreds of gigabytes. Printing only a final summary means hours of
+    # silence, in which a stall and steady progress look identical. Emit a
+    # heartbeat instead: rate and ETA come from the packs actually finished, so
+    # it stays honest when the disk slows down. stderr, so `> report.txt` keeps
+    # the summary clean.
+    total = len(packs)
+    started = time.monotonic()
+    # The heartbeat runs on its OWN CLOCK, in its own thread.
+    #
+    # Two weaker designs were tried and both go quiet exactly when you need them
+    # to speak. Ticking every N packs ties the cadence to how slow a pack is: 500
+    # packs is a blink in a --dry-run and many minutes in a real migration, so the
+    # run that most needs watching says the least. Ticking on time but only when a
+    # pack *finishes* is no better: if every worker is grinding on a huge archive,
+    # nothing completes, so nothing prints — and a stall becomes indistinguishable
+    # from progress, which is the one thing a progress meter must never allow.
+    #
+    # A daemon thread on a fixed interval reports regardless. If the count stops
+    # advancing between beats, you are looking at a stall, and you can see it.
+    HEARTBEAT_SECONDS = 10.0
+    done = 0  # only the main loop writes it; the beat thread only reads
+    stop_beat = threading.Event()
+
+    def heartbeat() -> None:
+        while not stop_beat.wait(HEARTBEAT_SECONDS):
+            elapsed = time.monotonic() - started
+            rate = done / elapsed if elapsed > 0 else 0.0
+            eta = (total - done) / rate if rate > 0 else 0.0
+            print(
+                f"  {done}/{total} ({100 * done / total:.1f}%)  "
+                f"{rate:.1f} packs/s  eta {eta / 60:.0f}m  "
+                f"[{len(problems)} problem(s)]",
+                file=sys.stderr,
+                flush=True,
+            )
+
+    print(
+        f"{total} pack(s) under {args.root} — "
+        f"{'verifying' if args.verify else 'dry run' if args.dry_run else 'migrating'} "
+        f"with {max(1, args.jobs)} job(s)",
+        file=sys.stderr,
+        flush=True,
+    )
+    beat = threading.Thread(target=heartbeat, daemon=True)
+    beat.start()
+
+    # as_completed, not pool.map: map yields in SUBMISSION order, so the counter
+    # would stall behind one slow pack while later ones were already done — a
+    # progress meter that lies about progress. Count each pack as it finishes.
+    try:
+        with ThreadPoolExecutor(max_workers=max(1, args.jobs)) as pool:
+            futures = {pool.submit(work, p): p for p in packs}
+            for fut in as_completed(futures):
+                pack = futures[fut]
+                status = fut.result()
+                counts[status] = counts.get(status, 0) + 1
+                if status not in ("migrated", "skip", "would-migrate", "ok"):
+                    problems.append((status, pack))
+                done += 1
+    finally:
+        stop_beat.set()
+        beat.join(timeout=1)
+
+    print(f"\n{len(packs)} pack(s) under {args.root}")
+    for status, n in sorted(counts.items(), key=lambda kv: -kv[1]):
+        print(f"  {n:>7}  {status}")
+    if problems:
+        print(f"\n{len(problems)} pack(s) need a look:", file=sys.stderr)
+        for status, pack in problems[:20]:
+            print(f"  {status:<22} {pack}", file=sys.stderr)
+        if len(problems) > 20:
+            print(f"  … and {len(problems) - 20} more", file=sys.stderr)
+    return 1 if problems else 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())