Add all recommended triggers to automerge action

Use the full set of triggers from pascalgn/automerge-action docs:
pull_request (labeled, synchronize, opened, etc), pull_request_review,
check_suite, and status events.

Replaces workflow_run trigger which wasn't firing reliably after
the label was added before CI completed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/automerge.yml

@@ -1,11 +1,23 @@
 name: Automerge
 
 on:
-  workflow_run:
-    workflows: ["CI"]
-    types: [completed]
   pull_request:
-    types: [labeled]
+    types:
+      - labeled
+      - unlabeled
+      - synchronize
+      - opened
+      - edited
+      - ready_for_review
+      - reopened
+      - unlocked
+  pull_request_review:
+    types:
+      - submitted
+  check_suite:
+    types:
+      - completed
+  status: {}
 
 env:
   FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
@@ -14,9 +26,6 @@ jobs:
   automerge:
     name: Automerge PR
     runs-on: ubuntu-latest
-    if: >
-      github.event_name == 'pull_request' ||
-      (github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'success')
     permissions:
       contents: write
       pull-requests: write