Builds on the loose-search fallback: that surfaces a recording stored under a
Japanese primary name (大橋純子) via its romanized alias, but the SCORER still
compared the reference ("Junko Ohashi") against the primary only → artist
similarity 0 → below the auto floor, so it could only ever be a manual
candidate, never an auto-fill.
- mb_match: `cand_artist_sim` takes the best similarity over the candidate's
primary name AND its `artist_aliases`; score_candidate + classify use it.
- server: `_mb_artist_aliases(id)` fetches an artist's aliases (one throttled
lookup, process-cached — a one-artist discography costs ONE request) and
`_alias_enrich` attaches them ONLY to promising near-misses (title agrees,
primary artist doesn't) so a normal pass spends zero extra requests. Wired
into both the auto-matcher (_enrich_one) and the manual search proxy.
Verified live: "Junko Ohashi / Telephone Number" → 大橋純子 candidate goes from
score 0.5 (loose-only) to 1.0 (auto-confirmable), ranked #1; "AC/DC / Highway
to Hell" unchanged at 1.0 with no alias lookup.
Stacks on #771 (feat/mb-loose-search-fallback).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
