Add linting with Black

.github/workflows/test.yaml

@@ -0,0 +1,12 @@
+name: Testing
+on: [push, pull_request]
+jobs:
+  lint-black:
+    name: Lint with Black
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+      with:
+        python-version: '3.13'
+    - run: uv run black --check src/