Copilot Middleware - Copilotkit

<Steps> <Step> ### Install the LangGraph Python SDK

<InstallPythonSDK />

</Step> <Step> ### Wire it into your graph

Import `CopilotKitMiddleware` and pass it to `create_agent`. This is the
single line of CopilotKit-specific setup; everything else is standard
LangGraph.

<DemoCode file="src/agents/frontend_tools.py" region="middleware" />

</Step> </Steps>