Turns the Stage-1 scorer into an end-to-end resolver + persists the result.
Still DORMANT — no consumer reads it yet, so zero behavior change.
- core/metadata/canonical_resolver.py — resolve_canonical_for_album(): builds
candidate releases from the album's per-source IDs (in source-priority order),
fetches each tracklist via an INJECTED fetch_tracklist (so it's unit-testable
without live APIs), scores them with pick_canonical_release, and returns the
best-fit {source, album_id, score}. Skips sources with no id / failed fetch;
returns None when there are no files, no candidates, or nothing clears the
confidence floor.
- database/music_database.py — set_album_canonical() / get_album_canonical()
write/read the Stage-1 columns. get returns None when unresolved, which every
consumer will treat as "fall back to today's behavior".
Tests: tests/test_canonical_resolver.py (7) — best-fit beats priority, priority
breaks true ties, skips missing-id/failed-fetch sources, None on
no-candidates/no-files/below-floor, score rounding. tests/test_canonical_db.py
(4) — set/get round-trip incl. timestamp, unresolved -> None, overwrite,
missing-album -> False. 34 canonical + DB-migration tests pass.
Remaining for Stage 2 (the trigger): read on-disk file durations/titles for an
album, gather its source IDs, call the resolver, store — wired via a backfill
repair job + an enrichment hook. Then Stages 3-4 wire the Reorganizer and Track
Number Repair to READ the pinned canonical.
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