## Summary

<!-- What does this PR do? Link related issues with "Fixes #123". -->

## Changes

<!-- Brief list of what changed. -->

## Testing

- [ ] `cargo clippy --workspace --all-targets -- -D warnings` passes
- [ ] `cargo test --workspace` passes
- [ ] Live integration tested (if applicable)

## Security

- [ ] No new unsafe code
- [ ] No secrets or API keys in diff
- [ ] User input validated at boundaries