- Python CLI tool for rolling updates of CL-AppPipe-* and CL-SvcPipe-* stacks
- Async update engine with configurable concurrency (asyncio.Semaphore)
- Exponential backoff retry for API throttling
- Dry-run mode for safe preview
- IAM permission pre-validation
- Comprehensive test suite (80 tests: 11 property-based + 69 unit)
- Full spec documentation (requirements, design, tasks)
