Add @beartype to pytest_collection_modifyitems hook

[adamtheturtle]

Summary

• Add @beartype decorator to pytest_collection_modifyitems in root conftest.py, which was the only non-fixture test helper missing it

Test plan

• CI passes with existing tests

Made with Cursor

---

Note

Low Risk
Test-only change that adds runtime type checking to a pytest hook; risk is limited to potential new type errors during collection.

Overview
Adds @beartype to the pytest_collection_modifyitems hook in conftest.py, so the hook itself is runtime type-checked like the rest of the test helpers.

No behavioral changes beyond enabling beartype validation when pytest invokes this hook during test collection.

^{Written by Cursor Bugbot for commit a99022f. This will update automatically on new commits. Configure here.}