# Decision Gate: Git State Pre-flight Check

**Branch**: `colonyos/every_time_the_pipeline_starts_we_should_look_at_what_branch_we_re_on_see_the_di`
**PRD**: `cOS_prds/20260319_081958_prd_every_time_the_pipeline_starts_we_should_look_at_what_branch_we_re_on_see_the_di.md`
**Date**: 2026-03-19

---

```
VERDICT: GO
```

### Rationale

All four persona reviewers unanimously approved in their final round (Round 3): Andrej Karpathy, Linus Torvalds, Principal Systems Engineer, and Staff Security Engineer. All 10 functional requirements from the PRD are fully implemented. The implementation correctly uses procedural logic (not LLM calls) for deterministic git state checks, has fail-closed semantics on the critical path (`git status` and `git checkout` failures raise errors rather than silently proceeding), and includes 607 lines of dedicated test coverage across 44 test cases. Earlier rounds raised CRITICAL findings (fail-open on `git status` OSError, missing HEAD SHA validation for resume), and these were all resolved before the final round.

### Unresolved Issues

(None blocking — all items below are acknowledged follow-ups)

- `_ensure_on_main()` runs `git pull --ff-only` even when `--offline` is set (MEDIUM — Principal Systems Engineer)
- `_get_head_sha` returns empty string on failure, making resume tamper-detection silently skip (MEDIUM — Principal Systems Engineer, Staff Security Engineer)
- `_save_run_log` mutates `log.preflight.head_sha` as a side effect (LOW — acceptable for V1)
- `--force` flag lacks an explicit audit warning to stderr (LOW — Staff Security Engineer)
- Task 7.3 manual happy-path test unchecked (process gap, not a code issue)

### Recommendation

Merge as-is. The two MEDIUM items (`--offline` not gating `git pull`, and `_get_head_sha` fail-open) should be tracked as fast-follow issues but do not block shipping — the blast radius of both is limited since the critical-path checks (dirty working tree, branch existence) are fail-closed. The implementation achieves all five PRD goals: preventing wasted compute, preventing data loss, preventing duplicate work, ensuring fresh foundations, and maintaining an audit trail.
