ci: add ready_for_review trigger to PR title validation workflow (#192)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: aaronsteers

.github/workflows/pr.yml

@@ -6,6 +6,7 @@ on:
       - opened
       - edited
       - synchronize
+      - ready_for_review
 
 permissions:
   pull-requests: read