Summary

Adds a dependency-free collaborative review freeze lane for issue #12.

The module models section-level manuscript freeze windows where direct edits pause, reviewer comments/suggestions/tasks continue, notebook execution freshness is checked, and stable version snapshots are emitted for autosave/history/audit workflows.

Validation

• node collab-review-freeze-lane/test.js
• node collab-review-freeze-lane/demo.js
• git diff --check

Demo artifact

• collab-review-freeze-lane/demo.svg
• node collab-review-freeze-lane/demo.js

/claim #12