headroom

When performing a pull request review in this repository:

1. Treat `.github/PULL_REQUEST_TEMPLATE.md` and `CONTRIBUTING.md` as required policy, not optional guidance.
2. Flag pull requests that do not include concrete "Real Behavior Proof" with environment, exact commands or steps, observed result, and what was not tested.
3. Be strict about contributor verification: missing tests, missing runtime evidence, or placeholder PR text should be called out.
4. For user-facing, release, dependency, workflow, or security-sensitive changes, prefer blocking feedback over optional suggestions.
5. Focus on correctness, safety, and whether the PR is actually ready for human maintainer review.