macOS system health toolkit with 5 audit modules (packages, environment,
security, cleanup, resources) and cleanup executor. Fixed bugs from review:
- Replace GNU timeout with perl alarm (macOS compatible)
- Remove Linux-only ps --sort flag, use portable sort
- Add JSON escaping to all audit scripts
- Remove redundant classify_size branch
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
