use uv to run test, more fixes

tests/run_with_uv.py

@@ -0,0 +1,8 @@
+"""Entry point for uv run: adds tests dir to path and runs pytest."""
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).parent.resolve()))
+import pytest
+
+sys.exit(pytest.main(sys.argv[1:]))