feat: one recording cut to several songs' lengths is named by AcoustID; the copy in its slot stays, the rest go, and the release is set aside (#6169)

Savant's Mortals held one recording as 16 of its 50 tracks, each trimmed to
its own slot's MusicBrainz length, so the lengths could not say which slot
was its own and every group waited for the operator. When a one-album
mismatch is the same audio (identical, or fingerprints within 0.02) and
every copy fits its own slot, the resolver asks what the recording is: the
copies' own AcoustID lookups, or a fresh lookup of one copy (five a pass).
The track list names each slot's recording; the copy in that slot is kept
and the others removed, or every copy when the recording is in none of
their slots or AcoustID knows none. AcoustID unreachable or answers in
several copies' slots: the group waits.

Whenever wrong-slot copies are removed, the download the files were
imported from is set aside, so the album fetched again is not the same
files. Albums imported before Minstrel downloaded anything have none.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/db/queries/duplicates.sql

@@ -195,8 +195,12 @@ UPDATE duplicate_groups
 -- prior_class is the class the last pass gave the group, NULL for a group no
 -- pass has seen. release_group_mbid is the album's MusicBrainz group, from its
 -- tags or the library listing's match; '' when neither names one.
+-- acoustid_state and acoustid_recording are what AcoustID said of the file,
+-- when it was looked up (#6169: which song one recording cut to several slots
+-- is).
 SELECT g.id                  AS group_id,
        g.tier,
+       g.worst_bit_error_rate,
        g.class               AS prior_class,
        t.id                  AS track_id,
        t.album_id,
@@ -216,13 +220,16 @@ SELECT g.id                  AS group_id,
                   AND t.track_number IS NOT NULL
                   AND o.disc_number IS NOT DISTINCT FROM t.disc_number
                   AND o.track_number = t.track_number)::boolean AS position_clash,
-       COALESCE(NULLIF(al.release_group_mbid, ''), lam.release_group_mbid, '')::text AS release_group_mbid
+       COALESCE(NULLIF(al.release_group_mbid, ''), lam.release_group_mbid, '')::text AS release_group_mbid,
+       l.state               AS acoustid_state,
+       l.recording_mbid      AS acoustid_recording
   FROM duplicate_groups g
   JOIN duplicate_group_members m ON m.group_id = g.id
   JOIN tracks t   ON t.id = m.track_id
   JOIN artists    ON artists.id = t.artist_id
   JOIN albums al  ON al.id = t.album_id
   LEFT JOIN library_album_matches lam ON lam.album_id = t.album_id AND lam.outcome = 'listed'
+  LEFT JOIN track_acoustid_lookups l ON l.track_id = t.id
  WHERE g.status = 'pending'
    AND t.missing_since IS NULL
  ORDER BY g.id, t.id;