Add agent langgraph basic - #263
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Lean LangGraph port of agent-openai-basic: local-first, API-first (Responses API), same mason/ split of SDK-migration plumbing. In-memory checkpointer by default; opt-in tracing and Lakebase durable background mode. Co-authored-by: Isaac <no-reply@databricks.com>
Co-authored-by: Isaac <no-reply@databricks.com>
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Adds agent-langgraph-basic, a lean LangGraph agent backend for Databricks Apps — the LangGraph counterpart to
agent-openai-basic.uv run start-server). Conversation state uses an in-process LangGraph checkpointer.POST /responses,POST /invocations).@toolfile inagent/tools/(auto-collected); add MCP servers inagent/mcps.py.mlflow.langchain.autolog()) — off by default, each enabled by an env var, no code change.mason/split: SDK-migration-candidate plumbing (checkpointer, tracing, MCP loading, wire translation) is grouped underagent/mason/, keeping the user-facing surface lean.