chore: add pull request template

Author: fernandomg

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,34 @@
+## Summary
+
+<!-- Why this change? What problem does it solve? Link motivation, not just mechanics. -->
+
+Closes #
+
+## Changes
+
+<!-- Brief description of what was changed. Bullet points work well. -->
+
+-
+
+## Acceptance criteria
+
+<!-- Mirror the criteria from the linked issue. Check them off as you go. -->
+
+- [ ]
+
+## Test plan
+
+<!-- How was this tested? Commands, screenshots, recordings — show your work. -->
+
+## Breaking changes
+
+<!-- If none, delete this section. If any, describe what breaks and migration steps. -->
+
+None.
+
+## Checklist
+
+- [ ] Self-reviewed my own diff
+- [ ] Tests added or updated
+- [ ] Docs updated (if applicable)
+- [ ] No unrelated changes bundled in