Update .github/copilot-instructions.md

Author: trask

.github/copilot-instructions.md

@@ -36,3 +36,4 @@ When implementing changes or new features:
 1. Follow all [Style Guide](../docs/style-guide.md) conventions and the Code Review Priorities above
 2. Run tests to ensure they still pass (use `./gradlew test` and `./gradlew integrationTest` as needed)
 3. **Always run `./gradlew spotlessApply`** after making code changes to ensure proper formatting
+4. Run markdown lint to ensure it still passes: `npx [email protected] -c .github/config/markdownlint.yml **/*.md`