Extend worker capabilities with new execution plugins and security features:
- Jupyter plugin for notebook-based ML experiments
- vLLM plugin for LLM inference workloads
- Cross-platform process isolation (Unix/Windows)
- Network policy enforcement with platform-specific implementations
- Service manager integration for lifecycle management
- Scheduler backend integration for queue coordination
Update lifecycle management:
- Enhanced runloop with state transitions
- Service manager integration for plugin coordination
- Improved state persistence and recovery
Add test coverage:
- Unit tests for Jupyter and vLLM plugins
- Updated worker execution tests
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