# Collaboration Metadata Foundation

UnifiedSpread dev-24.0.0 adds frontend metadata for collaboration-oriented features.

- Cell comments are stored in `workbook.config.collaboration.comments[]`.
- Protected ranges are stored in `workbook.config.collaboration.protectedRanges[]`.
- Change log entries are stored in `workbook.config.collaboration.changeLog[]`.

The runtime does not implement real-time collaboration in this milestone.  The goal is to stabilize the workbook metadata shape so a future Host/Backend adapter can synchronize comments, protection and history without changing the NativeGrid data model.