# Review by Principal Systems Engineer (Google/Stripe caliber) (Round 4)

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## Review Complete — Principal Systems Engineer (Google/Stripe caliber), Round 4

VERDICT: **approve** ✅

FINDINGS:
- **[src/colonyos/repo_map.py:SENSITIVE_PATTERNS]**: Missing `*.p12`, `*.pfx`, `id_rsa*` patterns — low severity, configurable workaround exists via `exclude_patterns`
- **[src/colonyos/repo_map.py:680-684]**: Greedy truncation leaves ~5-10% budget slack — correct tradeoff for ranked-order insertion
- **[src/colonyos/repo_map.py:724-729]**: Sequential file extraction could be parallelized for large repos — acceptable V1 latency (1-3s at 2000-file cap)

SYNTHESIS:
All findings from previous rounds are resolved. The two cosmetic fixes (duplicated comment removal, `dataclass_replace()` usage) are confirmed in the latest commit. The implementation is operationally sound across every dimension I care about: **blast radius is zero** (`try/except Exception` fail-closed in both `_run_pipeline()` and `run_ceo()`), **no race conditions** (map generated once as a string, passed by value to a pure function 9 times, no shared mutable state, no cache), **resource bounds are tight** (`_MAX_PARSE_SIZE` 1MB, `max_files` 2000, `subprocess.run(timeout=30)`), and **debuggability is excellent** (`colonyos map` CLI reproduces exactly what the agent sees, warning logs on every degraded path). All 19 functional requirements implemented, 336 tests pass with real git integration, zero regressions. Ship it.

Review saved to `cOS_reviews/reviews/principal_systems_engineer/20260331_round4_build_a_repomap_module.md`.