- Expand the directory-path follow-up section: PR #1428, 400 no-entry branch, heal-on-enable in both routers - Document the vitest fs-mock vs externalized workspace-dep trap and the real-fs drift-guard test pattern - Add Plugin Entry to CONCEPTS.md Plugins cluster Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>