fix(ci): trigger onboarding webhook on merge to next

Run the Cursor automation webhook after changes land on next via push, not while the PR is open.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: djabarovgeorge

.github/workflows/agent-onboarding-webhook.yml

@@ -1,7 +1,8 @@
 name: Notify Cursor Automation on Agent Onboarding Change
 
 on:
-  pull_request:
+  # Fires after a PR is merged to next (merge creates a push to the branch).
+  push:
     branches:
       - next
     paths: