fix(langgraph): lazy-load FastAPI endpoint import - #2236
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fastapi is an optional extra, but package __init__ eagerly imported endpoint.py (which imports fastapi at module top). Middleware-only installs then failed on any import of ag_ui_langgraph. Load the endpoint export via __getattr__ so core helpers work without fastapi installed. Fixes ag-ui-protocol#2013
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Summary
fastapiis declared as an optional extra forag-ui-langgraph, but package__init__.pyeagerly importedendpoint.py, which imports FastAPI at module top. Any middleware-only install then failed on:Fix
add_langgraph_fastapi_endpointat package import time.__getattr__so the FastAPI endpoint is only loaded when explicitly accessed.LangGraphAgent, helpers) work without FastAPI installed.Tests
Fixes #2013