fix: disable pytest-xdist for lowest-direct tests

Author: felixweinberger

.github/workflows/shared.yml

@@ -103,14 +103,15 @@ jobs:
             find .venv -name "__pycache__" -type d -delete 2>/dev/null || true
 
             # Run pytest directly from venv to avoid any uv resolution issues
+            # Disable xdist for lowest-direct to avoid subprocess issues
             # Isolate the Python environment completely
             export PYTHONNOUSERSITE=1
             export PYTHONPATH=""
             export PYTHONDONTWRITEBYTECODE=1
             if [ "$RUNNER_OS" == "Windows" ]; then
-              .venv/Scripts/python -m pytest -v
+              .venv/Scripts/python -m pytest -n 0
             else
-              .venv/bin/python -m pytest -v
+              .venv/bin/python -m pytest -n 0
             fi
           else
             uv run --frozen --no-sync pytest