opensymphony 1.7.2

A Rust implementation of the OpenAI Symphony orchestration design
Documentation
## Summary

<!-- Brief description of what this PR does -->

## Changes

<!-- List the key changes made -->

- 
- 
- 

## Evidence

<!-- 
For substantive changes, include evidence showing the change works as intended:
- Behavior changes: test output showing before/after
- Performance changes: benchmarks or timing data
- New features: usage examples or screenshots
- Bug fixes: reproduction case and verification
- UI changes: screenshots or video
- CLI changes: exact commands and output
-->

### Test output

```
<!-- Paste relevant test output here -->
```

### Verification

<!-- Describe how you verified this change works -->

## Checklist

- [ ] Tests pass (`cargo test`)
- [ ] Code is formatted (`cargo fmt`)
- [ ] Clippy is clean (`cargo clippy`)
- [ ] Documentation updated (if behavior changed)
- [ ] `AGENTS.md` updated (if repo knowledge changed)
- [ ] Evidence section filled out (for substantive changes)

## Type of change

- [ ] Bug fix
- [ ] New feature
- [ ] Performance improvement
- [ ] Refactoring
- [ ] Documentation
- [ ] Other: <!-- describe -->

## Breaking changes

<!-- List any breaking changes or "None" -->

## Related issues

<!-- Link to related Linear issues or GitHub issues -->

## Additional notes

<!-- Any other context reviewers should know -->