Support grouped skill folders while keeping skill invocation flat via frontmatter names.
Includes bounded nested SKILL.md discovery, refresh/watch coverage for grouped folders, plugin symlink containment, and docs for grouped skill organization.
Verification:
- Node 24 targeted skill discovery and refresh tests passed locally.
- Docs checks passed locally and in CI.
- Autoreview clean.
- Crabbox live OpenAI proof showed nested foo/bar skills listed and visible in the agent system prompt.
- CI run 26595118581 passed.