Add PR Template

Author: trask

.github/pull_request_template.md

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+## Changes
+
+<!-- Describe what behavior is changed by this PR. -->
+
+## Deprecations / Breaking changes
+
+<!-- Delete this section if there are none. -->
+
+Please describe any deprecations or breaking changes (including to unstable public APIs).
+
+## AI assistance disclosure
+
+<!-- We request this information to assist reviewers in identifying AI-generated errors and other issues specific to AI usage. -->
+<!-- You may delete this section if you are an approver in this repository. -->
+
+Did you use AI tools to create any part of this pull request?
+
+Please select one option and, if yes, briefly describe how AI was used (e.g., code, tests, docs) and which tool(s) you used.
+
+- [ ] No — I did not use AI for this contribution.
+- [ ] Yes — minimal assistance (e.g., IDE autocomplete, small code completions, grammar fixes).
+- [ ] Yes — substantive assistance (AI-generated non‑trivial portions of code, tests, or documentation).
+
+If yes, I have fully reviewed and thoroughly understand all of the code written by AI
+(skip if you selected 'No' above):
+
+- [ ] Yes
+- [ ] No — please be specific about which parts you do not thoroughly understand:
+
+## Documentation (please check one with an [x])
+
+- [ ] I have updated the documentation, or
+- [ ] No documentation update is required
+
+## How I've tested my work (please select one)
+
+I have verified these changes via:
+
+- [ ] Code inspection only, or
+- [ ] Newly added/modified unit tests, or
+- [ ] Other (please describe):