fix(ci): emit ci / ci on the merge-queue branch

.github/workflows/ci.yaml

@@ -3,6 +3,12 @@ on:
   pull_request:
     branches: [main]
   merge_group:
+    types: [checks_requested]
+  # seahaven-site never receives merge_group Actions runs, so `ci / ci`
+  # stays expected on the queue SHA. The queue branch push reports the same check.
+  push:
+    branches:
+      - "gh-readonly-queue/**"
 
 permissions:
   contents: read