Root cause of the duplicate deezer_id corruption: when enriching an album or
track, _verify_artist_id 'corrected' the parent artist's deezer_id to the
search result's primary-artist id whenever they differed — with NO name check.
For a collaboration/compilation track (e.g. one our library credits to Jorja
Smith that lives on Kendrick Lamar's curated 'Black Panther' album), the result
resolves to Kendrick's album, so Kendrick's id (525046) got written onto Jorja,
Vince Staples, SOB X RBE, etc. — many artists ending up with the same id.
Now the correction only fires when the result's primary-artist NAME matches the
parent artist (the album/track-artist path now mirrors _process_artist, which
already name-checks). Mismatches are logged and skipped as collab/compilation.
Note: this prevents new corruption; existing wrong ids in a library aren't
auto-repaired (per-artist enrichment preserves an existing deezer_id).
