Build ChromaDB + Tavily RAG agent with Ollama embeddings, local/web tools, create_agent routing, and CLI ingest flow.: add documents/langgraph_notes.md

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+# LangGraph notes
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+LangGraph is a framework for building stateful AI workflows and agents.
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+It is useful when you need explicit control over nodes, edges, checkpoints, retries, and human-in-the-loop steps.
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+A graph can route execution between tools, reflection steps, and validation steps.