Use * for keyword-only arguments in pytest fixtures

[adamtheturtle]

Pytest fixture functions should use * for keyword-only arguments when they have arguments. This change adds * to all affected fixtures.

Made with Cursor

---

Note

Low Risk
Signature-only changes in test fixtures; low risk aside from potential breakage if any fixtures are invoked directly with positional arguments.

Overview
Updates multiple pytest fixtures in conftest.py and tests/conftest.py to declare their dependencies as keyword-only by adding * to fixture function signatures.

This is a non-functional test harness change intended to enforce clearer fixture parameter passing and avoid accidental positional-argument usage.

^{Written by Cursor Bugbot for commit 4ab2542. This will update automatically on new commits. Configure here.}