## Summary

Describe the user-visible or technical outcome and how it was validated.

## API and architecture

- [ ] Not applicable: this change does not affect the frontend-neutral API or
      core/frontend ownership boundary
- [ ] Public DTOs or client methods were updated
- [ ] Capabilities were updated and only implemented support is advertised
- [ ] Events and structured errors were updated
- [ ] State, ordering, threading, cancellation, and security semantics were reviewed
- [ ] Contract tests were updated
- [ ] API documentation was updated
- [ ] `docs/api/CHANGELOG.md` was updated
- [ ] Compatibility and protocol-version impact were reviewed
- [ ] Generated API artifacts and the public-surface snapshot were deliberately refreshed

For an API-affecting change, complete the applicable items above and explain
any intentionally deferred client or transport work.

## Testing

List the commands run and any checks that were not available.
