Update PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

@@ -1,7 +1,8 @@
 # Pull Request
 
-Describe what this change does and why it is needed...
+## Summary
 
+Describe what this change does and why it is needed.
 ---
 
 ## Design Philosophy
@@ -109,7 +110,6 @@ If yes, please specify:
 AI assistance is allowed, but all submitted code must be fully understood, reviewed, and owned by the contributor.
 Any AI-influenced changes must be verified against existing CORE and PB logic. We expect contributors to be honest
 about what they do and do not understand.
-
 ---
 
 ## Final Checklist