Use uv run pytest when local Python/pytest commands are missing in uv projects

In a Python repo with pyproject.toml dependency groups and uv.lock, direct pytest, python -m pytest, and python3 -m pytest may fail (command not found or No module named pytest) depending on host tooling. Running uv run pytest executed tests successfully by using uv's managed environment. Verified 2026-04.

When pytest or even python is unavailable in shell for a uv-managed project, run tests via uv run pytest ... so uv provisions the project environment and dependencies automatically.