Add prompts.md documenting agentic IDE prompts used

Update README project structure and gitignore

Add multi-provider weather service, LFU cache, frontend panels, and tests

Add markdown rendering for agent responses

Switch LLM from OpenAI to Anthropic Claude and fix config loading

Fix agent backend: lazy LLM initialization

Add React Frontend: chat interface with weather agent

Add LLM Agent Backend: LangChain agent with tool calling

Add MCP Server: FastAPI wrapper for OpenWeatherMap API

Add project README and environment template

Initial commit: add .gitignore