Add local host mode and configurable LLM providers

README.md

@@ -60,6 +60,26 @@ operator view for the tasks that actually execute on that Host, including
 per-step screenshots, OCR observations, and UI-tree results. The Cloud Console
 remains the fleet-level view for dispatch status and Cloud-proxy planner history.
 
+## Local-only Host Agent
+
+Run without a Cloud Control Plane by setting `HOST_AGENT_MODE=local`. Tasks
+submitted in the Host console are queued and executed in the same process:
+
+```bash
+export HOST_AGENT_MODE=local
+export AI_PLANNER_ENABLED=true
+export AI_PLANNER_PROVIDER=openai-compatible
+export AI_PLANNER_MODEL=qwen2.5
+export AI_PLANNER_API_KEY=local-key
+export AI_PLANNER_BASE_URL=http://127.0.0.1:11434/v1
+uv run --package device-host-agent device-host-agent setup
+uv run --package device-host-agent device-host-agent
+```
+
+`openai-compatible` works with Ollama, LM Studio, vLLM, or another server that
+implements OpenAI `/chat/completions`. Hosted `openai` and `anthropic` providers
+also accept `AI_PLANNER_API_KEY` and their conventional API key variables.
+
 ## Project Direction
 
 The durable roadmap is in [docs/ROADMAP.md](docs/ROADMAP.md). The architecture