feat: pull request template v1 (#885)

.github/pull_request_template.md

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+## Reason for this PR
+
+<!--
+The "why" -
+
+Provide a short summary to answer "Why are these changes needed?".
+
+Include links to relevant Issues, and links to any background information or discussion.
+
+Help reviewers, and people in the future, understand the context behind this work.
+-->
+
+## Changes Made in this PR
+
+<!--
+
+The "what" -
+
+Provide a short summary of specific changes made in this pull request.
+
+The "how" -
+
+Explain the approach you took to address the problem - your reasoning.
+Mention any alternative approaches any why they didn't work.
+
+Detail any notable implementation details.
+-->
+
+## Testing Summary
+
+<!--
+Briefly explain how you tested and verified your work.
+
+e.g.
+
+- Tests run locally.
+- New tests created or tests updated.
+- Any tools run over code (linters/debugger walk/profiler).
+-->
+
+## Risk Highlight
+
+<!--
+Please add any additional comments to help reviewers and maintainers.
+-->
+
+- [ ] This PR includes code from another work (please detail).
+- [ ] This PR contains API-breaking changes.
+- [ ] This PR depends on work in another PR (please provide links/details).
+- [ ] This PR introduces new dependencies (please detail).
+- [ ] There are coverage gaps not covered by tests.
+- [ ] Documentation updates required in subsequent PR.
+
+## Checklist
+
+- [ ] Code comments added to any hard-to-understand areas, if applicable.
+- [ ] Changes generate no new warnings.
+- [ ] Updated any relevant tests, if applicable.
+- [ ] No conflicts with destination `dev` branch.
+- [ ] I reviewed my own code changes.
+- [ ] Initial CI/CD passing.
+- [ ] 1+ reviews given, and any review issues addressed and approved.
+- [ ] Post-review full CI/CD passing.