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

## Principal Systems Engineer Review — Complete

**VERDICT: approve** ✅

### Summary

The implementation is solid. All 10 functional requirements from the PRD are implemented, all 2215 tests pass (including 23 new ones), and the code follows existing orchestrator conventions cleanly. Here's what I found:

### Key Findings (none blocking)

| # | Severity | Finding |
|---|----------|---------|
| 1 | **Medium** | `git add -A` in the commit step stages everything — relies on `.gitignore` as last defense against accidental secret commits |
| 2 | **Low-Med** | Sequential path doesn't call `_inject_memory_block()` / `_drain_injected_context()` — memory context parity gap vs the single-prompt fallback |
| 3 | **Low** | No `impl_ui.phase_complete()` callback for overall sequential phase — minor UX gap in TUI |
| 4 | **Low** | Inline `import time` and `import re` inside function body — minor style deviation |

### What the implementation gets right

- **Failure model** — crashed task blocks only dependents, independent tasks continue, full status in PhaseResult. This is exactly what you want when debugging a broken run at 3am.
- **Commit-per-task** — later agents genuinely see prior work on the filesystem. The whole point of this PRD.
- **Fallback chain** — sequential → single-prompt for edge cases (empty task files, cycles). Defense in depth.
- **Budget predictability** — `phase_budget / task_count` is auditable and predictable.

Review artifact saved to `cOS_reviews/reviews/principal_systems_engineer/20260329_213252_round2_when_we_implement_a_new_functionality_from_the_tasks_it_should_not_happen_in_par.md`.
