- ProviderManager: align API with contracts ProviderAdapter - WorkerProtocol: add llm.request/llm.response message types - WorkerRuntime: add call_llm() for worker→parent→LLM flow - WorkerManager: support tool_registry and provider_manager injection P1-1 complete, P1-2 protocol layer complete. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>