PR #285's entity grounding checked only title + snippet. That missed:
- YouTube videos where the entity is mentioned in transcript but not
in title (false demotion of on-topic content)
- Reddit posts where the entity is in top comments but not in title
(false demotion of on-topic discussion)
And it also wasn't strong enough to reliably demote items like the
2026-04-19 Nate Herk "Managed Agents" video - which had no Hermes
anywhere - because the -25 penalty on rerank_score composed to only
-15 on final_score via the 0.60 weight, and engagement bonus partially
offset that.
Two fixes:
1. _candidate_haystack() now joins title + snippet +
metadata[transcript_snippet] + metadata[transcript_highlights] +
metadata[top_comments][*].excerpt/text + metadata[comment_insights].
Catches entity mentions wherever they actually live. Guarded with
isinstance checks so malformed metadata doesn't raise.
2. ENTITY_MISS_FINAL_PENALTY (20.0) applied directly in _final_score
when candidate.explanation contains "entity-miss". This lands the
full penalty weight on the composite signal that cluster-scoring
consumes, instead of being diluted by the rerank_score weight.
Combined effect: entity-miss gap grows from ~15 to ~35 points.
Tests: 8 new scenarios covering transcript match, transcript highlight
match, top-comment match, comment-insight match, empty-text skip,
no-primary-entity no-op, and the dual-penalty composition check.
Matt Van Horn
a7d6ef051a