Investigates root cause before any fix via Hierarchical Localization. TRIGGER: bug / test failure / runtime exception. NOT FOR: build failures (use java-build-resolver); fixes before Phase 1.
$npx -y skills add listener-he/java-harness-agent --skill root-cause-debugInstalls into the current project.
Run `npx skills use "https://github.com/listener-he/java-harness-agent" --skill "listener-he/java-harness-agent/root-cause-debug"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/listener-he/java-harness-agent" that are relevant to the current task. Run `npx skills add "https://github.com/listener-he/java-harness-agent"` and select the relevant skills, then follow their instructions.