fix: clear uv cache and .pyc files for lowest-direct tests

Author: felixweinberger

.github/workflows/shared.yml

@@ -54,7 +54,13 @@ jobs:
           version: 0.9.5
 
       - name: Install the project
-        run: uv sync ${{ matrix.dep-resolution.install-flags }} --all-extras --python ${{ matrix.python-version }}
+        run: |
+          if [ "${{ matrix.dep-resolution.name }}" == "lowest-direct" ]; then
+            # Clear cache for lowest-direct to ensure clean install
+            rm -rf $UV_CACHE_DIR/* 2>/dev/null || true
+          fi
+          uv sync ${{ matrix.dep-resolution.install-flags }} --all-extras --python ${{ matrix.python-version }}
+        shell: bash
 
       - name: Debug - Inspect installed anyio package
         if: matrix.dep-resolution.name == 'lowest-direct'
@@ -92,11 +98,15 @@ jobs:
         shell: bash
         run: |
           if [ "${{ matrix.dep-resolution.name }}" == "lowest-direct" ]; then
+            # Clean any stale .pyc files that might be causing issues
+            find .venv -name "*.pyc" -delete 2>/dev/null || true
+            find .venv -name "__pycache__" -type d -delete 2>/dev/null || true
+
             # Run pytest directly from venv to avoid any uv resolution issues
             # Isolate the Python environment completely
             export PYTHONNOUSERSITE=1
             export PYTHONPATH=""
-            export UV_PYTHON_PREFERENCE=only-system
+            export PYTHONDONTWRITEBYTECODE=1
             if [ "$RUNNER_OS" == "Windows" ]; then
               .venv/Scripts/python -m pytest -v
             else