# Review by Linus Torvalds (Round 4)

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VERDICT: approve

FINDINGS:
- [src/colonyos/config.py]: `Phase.VERIFY` not added to `_SAFETY_CRITICAL_PHASES` — PRD line 79 explicitly requires this. Low-risk since verify is read-only, but it's a stated requirement gap.
- [src/colonyos/orchestrator.py]: `Phase.FIX` reused for verify-fix agent — acceptable trade-off, phase ordering disambiguates.
- [src/colonyos/orchestrator.py]: `_verify_detected_failures()` fail-open on ambiguous output — correct design choice; sentinel narrows the window.

SYNTHESIS:
The implementation is correct, complete, and follows existing patterns without inventing new abstractions. The verify-fix loop is a clean copy of the review-fix loop pattern with proper budget guards, heartbeat touches, and hard-block on exhausted retries. The sentinel-based parsing of test output is the right approach — treat the prompt as a typed function with a parseable return value, then fall back to heuristics. Test coverage is excellent at 64+ tests covering the parsing boundary, pipeline integration, and config roundtrip. The single gap (`_SAFETY_CRITICAL_PHASES`) is low-risk and non-blocking. Ship it.
