## Description

<!-- Briefly explain the change and why it is needed. -->

Closes #

## Type of Change

- [ ] Bug fix (non-breaking change that fixes an issue)
- [ ] New feature (non-breaking change that adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)
- [ ] Documentation update
- [ ] Performance improvement
- [ ] Code refactoring (no functional changes)

## Changes Made

- 

## Testing

<!-- Check what you actually ran, then paste the real command output below. -->

- [ ] Unit tests pass (`pytest`)
- [ ] Linting passes (`ruff check .`)
- [ ] Type checking passes (`mypy headroom`)
- [ ] New tests added for new functionality
- [ ] Manual testing performed

### Test Output

```text
# Paste relevant command output or artifact links here
```

## Real Behavior Proof

- Environment:
- Exact command / steps:
- Observed result:
- Not tested:

## Runtime Rollout Safety

- Rollout-managed feature(s):
- Minimum rollout channel:
- Stable/default behavior changed:
- Kill switch / disable path:
- Unsafe override required:
- Qualification impact:
- Rollback path:

## Review Readiness

- [ ] I have performed a self-review
- [ ] This PR is ready for human review

## Checklist

- [ ] My code follows the project's style guidelines
- [ ] I have performed a self-review of my code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] I did **not** edit `CHANGELOG.md` — it is generated by release-please from my Conventional Commit PR title (a CI guard enforces this)

## Screenshots (if applicable)

Add screenshots to help explain your changes.

## Additional Notes

<!-- Mention any N/A checklist items, tradeoffs, follow-ups, or maintainer context. -->