resolveNames now delegates to PersonService.resolveByName and maps by match
strength: 1 direct → resolved (auto-select), ≥2 direct → ambiguous, 0 direct
with partials → ambiguous suggestions, 0 candidates → folded into full-text.
A single direct match no longer forces the picker when looser substring hits
coexist. The MAX_CANDIDATES cap moved into PersonService (after classification);
the MAX_NAME_LENGTH guard, resolved-cap overflow, and sender/receiver mapping
are preserved.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>