The cross-script alias bridge (#442/#586) silently returned [] for some
artists ("Sawano Hiroyuki"). Root cause: the mb-only escape — built exactly
for the case where local string similarity is ~0 (romaji↔kanji) but MB's own
score is decisive — inspected scored[0], the COMBINED-score leader. When an
unrelated same-script decoy outranks the real artist on combined score (decoy:
sim 0.82 + mb_score 83 → combined 0.82, just under the 0.85 bar; real '澤野弘之':
sim 0 + mb_score 100 → combined 0.30, sorted last), the gate saw the decoy's
mb_score 83 (< 95), failed both paths, and cached an empty alias result.
Verification then scored the kanji artist 0% against the romaji expected name
and quarantined every correct file.
Evaluate the MB-SCORE leader independently of combined ranking for the mb-only
escape, and pull aliases from whichever entity actually passed (combined leader
for the combined path, MB-score leader for the mb-only path). The unambiguity
check now compares the top two raw MB scores. Same-script and single-result
paths are unchanged (regression-guarded by the existing #442/#586 tests).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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