Add format checks

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

Author: maurolacy

.github/workflows/local-tests.yml

@@ -13,4 +13,6 @@ jobs:
     steps:
     - uses: actions/[email protected]
     - name: Build contracts, check formats, and run unit tests
-      run: cargo test --lib
+      run: |
+        cargo fmt -- --check
+        cargo test --lib