# Decision Gate

Verdict: **GO**

## Decision Gate Complete

```
VERDICT: GO
```

### Rationale
All four personas (Karpathy, Torvalds, Principal Systems Engineer, Staff Security Engineer) **unanimously approve** after four rounds of review. All 10 functional requirements from the PRD are fully implemented across 1,962 lines of changes in 12 files, with 447 tests passing and zero regressions. There are **zero CRITICAL or HIGH findings** — only LOW-severity known edge cases (word-boundary regex matching on "line 529", verbose `retry_config=` threading through ~20 call sites) that are well-documented and accepted as v1 tech debt.

### Unresolved Issues
*(None blocking)*

### Recommendation
**Merge as-is.** The implementation is production-ready:
- **Architecture**: Retry at the transport layer inside `run_phase()`, invisible to the orchestrator's heavyweight recovery system
- **Safety**: Fallback model allowlist validation, hard-blocked fallback on safety-critical phases (`review`, `decision`, `fix`), error message sanitization
- **Testing**: 57+ new tests covering retry logic, fallback, config validation, serialization round-trips, and edge cases
- **Observability**: `RetryInfo` on `PhaseResult` flows into `RunLog` for post-run analysis

The decision artifact has been written to `cOS_reviews/decisions/20260330_001000_decision_the_following_github_issue_is_the_source_feature_description_treat_it_as_the_pri.md`.