ci: add comment explaining Windows bash test behavior

Author: mnriem

.github/workflows/test.yml

@@ -47,5 +47,9 @@ jobs:
       - name: Install dependencies
         run: uv sync --extra test
 
+      # On windows-latest, bash tests auto-skip unless Git-for-Windows
+      # bash (MSYS2/MINGW) is detected. The WSL launcher is rejected
+      # because it cannot handle native Windows paths in test fixtures.
+      # See tests/conftest.py::_has_working_bash() for details.
       - name: Run tests
         run: uv run pytest