## Status: ✅ Complete\n\n**Branch:** `feature/concurrency-guard` | **Combined:** `feature/combined-bastion` | **Upstream PR:** pending\n\n## Summary\nasyncio.Semaphore serializes Metal GPU access. `--max-concurrent-requests` flag (default 1).
Status: ✅ Complete\n\nBranch:
feature/concurrency-guard| Combined:feature/combined-bastion| Upstream PR: pending\n\n## Summary\nasyncio.Semaphore serializes Metal GPU access.--max-concurrent-requestsflag (default 1).