# Review by Principal Systems Engineer (Google/Stripe caliber) (Round 2)

## Review Complete — Principal Systems Engineer, Round 3

**VERDICT: approve** ✅

**82/82 tests pass. No regressions.**

### Summary

All 15 functional requirements are implemented and verified. The previous iteration's 7 findings (duplicated store connections, full-table scan, missing WorktreeManager usage, merge timeout, missing escalation, redundant API calls, timestamp-on-failure) have all been properly resolved.

### Findings (2 non-blocking, 2 informational)

| Severity | File | Finding |
|---|---|---|
| **MEDIUM** | `daemon.py:1105` | FR-13 partial gap — write-enabled gate only checks `dashboard_write_enabled` config, not `COLONYOS_WRITE_ENABLED` env var. Operators using the env var alone will have sync silently disabled. |
| **LOW** | `daemon.py:359` | `_last_pr_sync_time = 0.0` triggers immediate sync on startup — acceptable but may cause CI churn on frequent restarts. |
| **INFO** | `pr_sync.py:187,195` | Slack truncates conflict list to 5 files; PR comment to 10 — minor asymmetry. |
| **INFO** | `pr_sync.py:279` | `_get_rev` returns `"unknown"` string on failure, which flows into success logs cosmetically. |

### Architecture Assessment

The implementation is solid from a systems perspective:
- **Worktree isolation** prevents working tree corruption and avoids contention with active pipelines
- **Cached mergeStateStatus** from outcome polling eliminates redundant GitHub API calls
- **1-PR-per-tick sequential model** matches the daemon's philosophy and avoids race conditions
- **Failure tracking with escalation** provides clean degradation — no infinite retry loops
- **Circuit breaker isolation** (FR-11) correctly keeps sync failures from tripping the global breaker

Review saved to `cOS_reviews/reviews/principal_systems_engineer/20260331_131622_round3_daemon_pr_sync.md`.
