chore: add tidy

.github/workflows/test.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches: [ main ]
   pull_request:
+  merge_group:
   workflow_dispatch:
 
 permissions:
@@ -31,6 +32,9 @@ jobs:
         with:
           install-mode: none
 
+      - name: Run tidy
+        run: make tidy && git diff --exit-code
+
       - name: Run lint
         run: make lint