## Summary

-

## Proof

- [ ] Focused tests:
- [ ] `poe proof-pr` or scoped equivalent:
- [ ] Docs/examples/changelog updated or no-impact noted: <!-- changelog.d/ fragment: lead with one user-facing sentence, then engineering detail (see docs/b-stack-changelog-strategy.md) -->

## Performance Evidence

Required when this PR makes a performance claim, changes a hot path, or changes
free-threaded/concurrent behavior.

- Benchmark matrix row:
- Command:
- Python build:
- Machine/OS:
- Baseline commit or saved result:
- Current commit or saved result:
- Artifact path:
- Interpretation:

CI only enforces this section for performance-sensitive behavior paths. Use
`not applicable` when those paths changed but the PR makes no performance
claim.

## Steward Notes

-
