chore: import upstream snapshot with attribution

.github/pull_request_template.md

@@ -0,0 +1,32 @@
+## Summary
+Brief description of the changes in this PR.
+
+## Type of Change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Performance improvement
+- [ ] Documentation/Tests
+
+## Objective
+**For new features and performance improvements:** Clearly describe the objective and rationale for this change.
+
+## Testing
+- [ ] Unit tests added/updated
+- [ ] Integration tests added/updated
+- [ ] All existing tests pass
+
+## Breaking Changes
+- [ ] This PR contains breaking changes
+
+If this is a breaking change, describe:
+- What functionality is affected
+- Migration path for existing users
+
+## Checklist
+- [ ] Code follows project style guidelines (`make lint` passes)
+- [ ] Self-review completed
+- [ ] Documentation updated where necessary
+- [ ] No secrets or sensitive information committed
+
+## Related Issues
+Closes #[issue number]