Root-cause a bug, test failure, build break, or unexpected behavior before proposing any fix -- never patch a symptom. Reproduce it, trace data flow backward, form one testable hypothesis, verify it minimally, then fix the root cause after confirmation. Also capture a standing repro with `/debugger file`. `/debugger setup` deploys optional project templates and the diagnostics operation. Use for failed tests, reported bugs, unexpected behavior, broken builds, repro filing, or Debugger configuration.
