Add PR Template

Author: trask

.github/.markdownlint.yaml

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+# Override for PR template - first line doesn't need to be H1
+extends: ../.markdownlint.yaml
+MD041: false

.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
+
+<!-- This disclosure helps reviewers watch for issues commonly associated with AI-generated content. -->
+<!-- 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 check one with an [x])
+
+- [ ] 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, have you thoroughly reviewed and 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
+
+I have verified these changes via: (please check one with an [x])
+
+- [ ] Code inspection only, or
+- [ ] Newly added/modified unit tests, or
+- [ ] Other (please describe):