Add PR template mirroring PrairieTest

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: reteps

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,32 @@
+# Description
+
+<!--
+
+- Summarize your changes and explain the rationale for making them.
+- Include any relevant context from Slack, meetings, or other discussions.
+- If this change is resolving a specific issue, include a link to the issue (e.g. "closes #1234").
+- If applicable, include screenshots and/or videos.
+- Note the level of AI assistance used (i.e. none, specific portions, majority of implementation).
+
+-->
+
+# Testing
+
+<!--
+
+- Share how you tested your changes.
+- If you're fixing a bug, explain how to reproduce the original issue.
+- If applicable, make sure you've authored unit and/or integration tests.
+- If applicable, provide instructions for a reviewer to test the changes for themselves.
+- If applicable, mention any accessibility testing that was done.
+
+If you re-test your PR after significant changes, please add a comment to the PR saying so.
+
+Self-reviews with GitHub's review UI are encouraged to point out the following:
+
+- Explanations for code or design decisions that may confuse reviewers.
+- Particularly important or core changes.
+- Items that may need further discussion.
+- Changes that may warrant additional testing.
+
+-->