Four refinements on top of the tiered matcher:
1. Direct source track-ID tier (new top tier): enrichment writes each source's own
track ID into the file tags (spotify_track_id/deezer_track_id/itunes_track_id/...).
If we have the active source's track ID, fetch that exact track by ID via
get_track_details — zero search. Tiers are now: track-ID -> ISRC -> album->track
-> artist+title. _read_file_ids reads ISRC + all per-source IDs in one tag read.
2. Skip already-proposed tracks: a re-run loads existing finding entity_ids for the
job and skips those tracks before any API call (pending stays deduped, dismissed
stays dismissed) — re-runs are cheap.
3. Wrong-version guard: the fuzzy tiers (album-search + track search) reject a
candidate whose length differs from ours by >5s (live/edit/remix with same title).
_load_tracks now selects t.duration; exact tiers (track-ID/ISRC/stored-album-ID)
skip the guard.
4. Tighter album matching: same-title cuts in an album are disambiguated by closest
duration when track_number doesn't decide it.
Findings record matched_via = track_id | isrc | album | search. 30 repair tests pass
(added track-ID tier, duration guard, dedup-skip, and unit coverage).
030d9bf9ff