launch

Server lifecycle orchestration for the app.

Provides start_server_and_get_agent which handles the full flow of:

1. Building a ServerConfig from application arguments
2. Writing config to env vars via ServerConfig.to_env()
3. Scaffolding a workspace (langgraph.json, checkpointer, pyproject)
4. Starting the langgraph dev server
5. Returning a RemoteAgent client

Also provides server_session, an async context manager that wraps server startup and guaranteed cleanup so callers don't need to duplicate try/finally teardown.

LangGraph server lifecycle management for the app.

Handles starting/stopping a langgraph dev server process and generating the required langgraph.json configuration file.