docs(readme): add contributor quick verification commands

Author: however-yir

README.md

@@ -252,3 +252,13 @@ _Coming soon_
 - Install dependencies for this module before execution.
 - Use the standard project command to build and run (for example Maven, Gradle, npm, or Python entrypoint scripts in this repository).
 
+
+## Contributor Quick Verification
+<!-- codex-batch30-readme -->
+
+Before opening a PR, run these quick checks locally:
+
+- Build: `./gradlew help`
+- Tests: `./gradlew test`
+- Keep changes focused: one topic per PR with a clear title
+