chore: add github pull request template

.github/pull_request_template.md

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+## Summary
+
+<!-- A few bullets is perfect: what changed, why it changed, and anything reviewers should pay attention to. -->
+
+- **What:** 
+- **Why:** 
+- **Notes for reviewers:** 
+
+## How to verify
+
+<!-- Concrete steps to validate the change. Include screenshots/recordings for UI changes when helpful. -->
+
+1.
+2.
+3.
+
+## Tests
+
+<!-- List what you ran, or explain why tests weren’t added/changed. -->
+
+- [ ] Added/updated tests (where it makes sense)
+- [ ] Unit tests:
+- [ ] Integration tests:
+- [ ] Manual verification:
+
+## Checklist
+
+- [ ] PR targets `canary`
+- [ ] PR title follows Conventional Commits (mostly lowercase)
+- [ ] CI is green (or I’m actively addressing failures)
+- [ ] CLA signed (the bot will guide you on first PR)
+
+## Screenshots / recordings (UI changes)
+
+<!-- Drag and drop images/videos here. -->