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feedpak 1.2.0 added song-level `tempos` + `time_signatures` to song_timeline.json
and a per-chart `tempos` override on arrangements (§6.10). Core stored the raw
song_timeline dict but never consumed the maps, and didn't read per-chart tempos.
- song.py: shared `sanitize_tempos([{time,bpm}])` (finite non-bool time, finite
bpm>0, sorted); `Arrangement.tempos` field wired through arrangement_to_wire
(omitted when None/empty per §6.10) / arrangement_from_wire.
- sloppak.py: `_sanitize_time_signatures([{time,ts:[num,den]}])`;
LoadedSloppak.tempos / .time_signatures, loaded from song_timeline.json
INDEPENDENTLY of beats/sections (all are optional in 1.2.0).
- server.py: stream `tempos` + `time_signatures` highway-WS messages; the active
arrangement's per-chart `tempos` overrides the song-level map for that chart.
Renderer/UI surfacing is a thin follow-up; this lands the data plumbing.
Codex-reviewed: clean (no findings). +9 tests (sanitizers, per-chart wire
round-trip + omit-when-absent, song-level load/sanitize/absent + maps-without-
beats). 90 song/sloppak tests pass. (Pre-existing unrelated failure:
test_diagnostics_redact, fails on clean main too.)
Closes #526. Part of got-feedback/feedback#334.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>