Add comprehensive capability routing system to scheduler hub:
- Capability-aware worker matching with requirement/offer negotiation
- Hub v2 protocol with structured message types and heartbeat management
- Worker capability advertisement and dynamic routing decisions
- Orphan recovery for disconnected workers with state reconciliation
- Template-based job scheduling with capability constraints
Add extensive test coverage:
- Unit tests for capability routing logic and heartbeat mechanics
- Unit tests for orphan recovery scenarios
- E2E tests for capability routing across multiple workers
- Hub capabilities integration tests
- Scheduler fixture helpers for test setup
Protocol improvements:
- Define structured protocol messages for hub-worker communication
- Add capability matching algorithm with scoring
- Implement graceful worker disconnection handling
Add new scheduler component for distributed ML workload orchestration:
- Hub-based coordination for multi-worker clusters
- Pacing controller for rate limiting job submissions
- Priority queue with preemption support
- Port allocator for dynamic service discovery
- Protocol handlers for worker-scheduler communication
- Service manager with OS-specific implementations
- Connection management and state persistence
- Template system for service deployment
Includes comprehensive test suite:
- Unit tests for all core components
- Integration tests for distributed scenarios
- Benchmark tests for performance validation
- Mock fixtures for isolated testing
Refs: scheduler-architecture.md
