ci(python-gonol): gate structural consistency before merge

Author: erinepshovel-code

.github/workflows/python-gonol.yml

@@ -34,6 +34,8 @@ jobs:
           python-version: "3.12"
       - name: Install pytest
         run: python -m pip install pytest
+      - name: Stack structural consistency
+        run: python tools/check_stack_consistency.py
       - name: Python Gonol construction tests
         working-directory: research/python-gonol
         run: python -m pytest -q tests