Clean release snapshot

resources/models/README.md

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+# Bundled ML models
+
+## basic_pitch.onnx — Spotify Basic Pitch (polyphonic note detection)
+
+The note model used by `MlNoteDetector` (`src/audio/MlNoteDetector.cpp`) for
+TST-style polyphonic note detection.
+
+- **Source:** the `basic-pitch` PyPI package, v0.4.0 —
+  `basic_pitch/saved_models/icassp_2022/nmp.onnx`, copied here verbatim.
+- **Upstream:** Spotify Basic Pitch — https://github.com/spotify/basic-pitch
+- **License:** Apache-2.0 (see the upstream `LICENSE`).
+- **SHA-256:** `2c3c1d144bfa61ad236e92e169c13535c880469a12a047d4e73451f2c059a0ec`
+- **I/O contract:** input `[batch, 43844, 1]` float32 (~2 s mono @ 22050 Hz);
+  outputs onset / note / contour posteriorgrams. See
+  `tests/spike/README.md` for the verified contract.
+
+Bundled into the packaged app via `electron-builder`'s `extraResources`
+(Constitution IV — offline first-run). When the file is absent the engine
+falls back to the YIN `PitchDetector` / `ChordScorer` (Constitution VII).