LangChain CI Integration (Python)

Overview

A PR passes every test on your laptop. You push. GHA runs pytest and aborts during collection — before a single test executes — with:

PytestUnraisableExceptionWarning: Exception ignored in: ...
DeprecationWarning: langchain_community.llms ...

The org runs pytest -W error and a provider SDK emitted a DeprecationWarning at import time, which the warning filter promoted to an exception while pytest was still walking the test tree. This is P45 and it blocks every PR for the team until someone pins a filterwarnings config.