added black to CI

Author: feefladder

.github/workflows/test-python.yml

@@ -68,6 +68,10 @@ jobs:
         working-directory: python
         run: uv run --no-project maturin develop
 
+      - name: Black formatting
+        working-directory: python
+        run: uv run --no-project black .
+
       - name: Run pytest
         working-directory: python
         run: uv run --no-project pytest --verbose