chore(esp): guard meshtastic stack hygiene

.github/workflows/ci.yml

@@ -18,6 +18,9 @@ jobs:
       - name: Verify shared/platform UI boundaries
         run: python3 scripts/check_platform_ui_boundaries.py
 
+      - name: Verify ESP stack hygiene
+        run: python3 scripts/check_esp_stack_hygiene.py
+
       - name: Verify repository root has no build artifacts
         run: python3 scripts/check_root_build_artifacts.py