Replaces the ilike-suffix fallback with explicit bare-name character
matching: 0 candidates -> create null-fandom, 1 -> attach, N -> 409
with candidate list for frontend disambiguation. Accepts explicit
tag_id to complete the disambiguation round-trip.
Preserves existing behavior on the accept side:
- defensive _canonicalize_wd14_name on the boundary
- SuggestionFeedback row logged on every accepted decision
(including the explicit_tag_id path). Ambiguous 409 does not
log — no decision has been made yet.
- conditional centroid recompute enqueue for eligible kinds
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
bvandeusen
bdd69c0a07