#768 added canonical_source_track to the live-sync matcher and the playlist
editor reconcile, but NOT to the two paths that actually run for file/CSV
mirrored playlists: the discovery worker (core/discovery/playlist.py) and the
DB-only matcher (core/discovery/sync.py). YouTube playlists are cleaned at
ingest, so they matched; file playlists fed the raw 'Arctic Monkeys - Do I
Wanna Know?' title into search+scoring and never matched the library's clean
'Do I Wanna Know?' → reported missing / shown as 'extra'.
Add a conservative canonical best-of to both: score with the raw title AND the
canonicalized one, keep the better. canonical_source_track only strips an
'<artist> - ' prefix when it equals the artist, so it can only add a candidate.
Tests: _canonical_best_score seam (file-style match / clean title scored once /
keeps original when better).
6cb753e7a1