# Review by Andrej Karpathy (Round 4)

The review is complete. Here's the summary:

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**VERDICT: approve**

**FINDINGS:**
- `[scripts/generate-homebrew-formula.sh]`: `setuptools<78` pin will eventually need updating — add a comment linking to the pkg_resources deprecation timeline. Non-blocking.
- `[deploy/provision.sh]`: `NODE_MAJOR=20` is hardcoded; extract to a top-level constant for easier bumping when Node 22 LTS lands. Non-blocking.

**SYNTHESIS:**
This is a well-executed infrastructure PR that delivers all 7 PRD functional requirements. All 403 tests pass (334 unit + 69 e2e) with zero regressions. The implementation shows good engineering taste throughout — deterministic formula generation via `homebrew-pypi-poet`, proper concurrency control on tap updates, graceful warn-not-fail for non-git repos, and simple-but-correct install method detection via `sys.executable` path heuristics. All 4 round-1 findings (silent secret input, credential helper, redundant `which` removal, sed comment) have been properly addressed, plus the iteration-3 fix switching the failure notification step to `GITHUB_TOKEN`. No LLM-layer interaction means the primary AI risk vectors don't apply. The two findings are minor maintenance hygiene items. Ship it.

Review saved to `cOS_reviews/reviews/andrej_karpathy/20260330_182656_round2_add_brew_installation_we_should_be_able_to_have.md`.
