## Summary

Describe the change and motivation.

## Checklist

- [ ] Tests added/updated
- [ ] `cargo test` passes locally
- [ ] Docs updated
  - [ ] Existing docs updated where behavior changed
  - [ ] New doc added under `docs/` if introducing a new area
  - [ ] Linked from `docs/README.md`

## Links / Design notes

Add design notes, code pointers, or diagrams if helpful.
