Fix CI: only check linter, not formatter

Co-authored-by: kevinbackhouse <[email protected]>

Author: Copilot

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
 
     - name: Run static analysis
       run: |
-        hatch fmt --check
+        hatch fmt --linter --check
 
     - name: Run tests
       run: hatch test --python ${{ matrix.python-version }} --cover --randomize --parallel --retries 2 --retry-delay 1