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.github/pull_request_template.md

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+## Summary
+
+Describe what changed and why.
+
+## Spec Link (Required For Feature Changes)
+
+- Spec file in `docs/specs/`: <!-- e.g. docs/specs/2026-04-15-speed-adjustment.md -->
+
+## Acceptance Criteria Checklist
+
+- [ ] Acceptance criteria reviewed against the linked spec
+- [ ] User-visible behavior verified for this change
+- [ ] Backward compatibility impact assessed
+
+## Validation
+
+- [ ] `./scripts/validate-all.sh` passes locally
+- [ ] Added/updated tests for changed behavior
+
+## Risk And Rollback
+
+- Risk level: Low / Medium / High
+- Rollback plan: