Next steps (LangChain):
  ───────────────────────
  1. Install the Python adapter (required for runtime enforcement):
     pip install aport-agent-guardrails-langchain
     aport-langchain setup
  2. Config written to: $config_dir
  3. Add to your agent:

     from langchain.agents import create_agent
     from aport_guardrails_langchain import APortCallback

     agent = create_agent(model=model, tools=tools)
     result = await agent.ainvoke(
         {"messages": [{"role": "user", "content": "run the task"}]},
         config={"callbacks": [APortCallback()]},
     )

  See: docs/frameworks/langchain.md