Gemini vision (solves chess), solver plain-text fallback, pandas in python_repl

Fetch task files from HF Hub GAIA dataset (scoring API /files is 404)

Add openai_compatible provider branch for freellmapi gateway

Default to Gemini 2.5-flash (thinking disabled) for text/judge nodes

Add provider toggle (Groq/Gemini) + global rate limiter to beat free-tier limits

Document LangSmith tracing env vars

GAIA LangGraph agent: Groq + Tavily + LLM-as-judge