Updated PHASE2_SUMMARY.md to include:
- ✅ Task 8: Scheduler health API endpoint completion
- ✅ Task 9: Unit testing completion (40+ test cases)
- Updated git commit history (9 commits total)
- Revised known limitations (removed API/testing gaps)
- Updated future work section
Phase 2 achievements:
- 9/10 tasks complete (only integration/soak tests deferred)
- 40+ unit tests covering backoff, circuit breakers, staleness
- Full scheduler health API with authentication
- Comprehensive documentation and rollout plan
- Production-ready with feature flag control
Remaining work (deferred to future):
- Integration tests with mock PVE/PBS clients
- Soak tests for extended queue stability
- Write endpoints for circuit breaker/DLQ management
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