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Lets a .sloppak ship the single pre-separation full mixdown next to its
per-instrument stems, so the player can use the pristine original when nothing
is isolated (demucs recombination is lossy) and switch to separated stems only
when a slider drops below unity.
- lib/sloppak.py::load_song parses the optional manifest `original_audio:` key
into a new LoadedSloppak.original_audio field, with the same path-traversal
guard + permissive "missing → disabled" posture as the drum_tab loader.
- The highway WS song_info frame additively carries original_audio_url (served
by the existing /api/sloppak/{filename}/file/{rel_path} endpoint, None for
stems-only packs), has_original_audio, and has_stems.
- A stem-less, full-mix-only sloppak now sets audio_url to the full mix (plays
natively) instead of emitting audio_error.
Message shape stays a stable contract — all additions are purely additive.
Tests: tests/test_sloppak_original_audio_load.py (6 passing).
Closes #580
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>