Enhance PR template with structured sections (#6989)

* Enhance PR template with description, type of change, and checklist sections

Co-authored-by: Cursor <cursoragent@cursor.com>

* Update PR template to streamline instructions for writing release notes

* Remove unnecessary lines from the PR template to streamline instructions for writing release notes

* Add release notes for PR #6989

* Update category in release notes

Changed category from Enhancements to Maintenance.

* Update PULL_REQUEST_TEMPLATE.md

* Update AGENTS.md and PULL_REQUEST_TEMPLATE.md to clarify PR submission guidelines

* Update 6989.md

---------

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -1 +1,21 @@
 <!-- Thank you for submitting a pull request! Make sure to follow the instructions to write release notes for your PR — it should only take a minute or two: https://github.com/actualbudget/docs#writing-good-release-notes. Try running yarn generate:release-notes *before* pushing your PR for an interactive experience. -->
+
+## Description
+
+<!-- What does this PR do? Why is it needed? Please give context on the "why?": why do we need this change? What problem is it solving for you?-->
+
+## Related issue(s)
+
+<!-- e.g. Fixes #123, Relates to #456 -->
+
+## Testing
+
+<!-- What did you test? How can we reproduce the issue you are fixing or how can we test the feature you built? -->
+
+## Checklist
+
+- [ ] Release notes added (see link above)
+- [ ] No obvious regressions in affected areas
+- [ ] Self-review has been performed - I understand what each change in the code does and why it is needed
+
+<!--- actual-bot-sections --->