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- Insert code_review phase between implement and bug_find - Approval gate: code_review:awaiting_approval → code_review:approved - Read-only phase — no edits, no fixes, no returning to implement - Reviewer≠implementer: .state.implementer tracking + --claim enforcement - Structured CODE_REVIEW.md: spec compliance, design conformance, quality scorecard, items found (severity/category/location/resolution), test coverage - Updated status.py (10 data structures), dashboard (4 files), prompts (3 files), agent routing, tests (6 new test classes, 19 new tests)