Set explicit GitHub Actions Workflow permissions

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: doismellburning

.github/workflows/test.yml

@@ -11,6 +11,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 env:
   UV_LOCKED: 1  # Ensure lockfile is up to date at test time