- Zeroize passwords in CLI prompts, handlers, and mount authentication
- Preserve carrier_node_id when recovering Slot 0 via recovery key
- Add --slot parameter to restore-header for targeted slot recovery
- Implement online_backup and restore_from_backup using SQLite Online Backup API
- Expose 'sanctum backup' and 'sanctum restore' CLI subcommands
- Fix inactivity auto-lock by removing touch() from PROPFIND metadata/read_dir
- Support O_APPEND by setting file cursor to file size on handle creation
- Prevent data loss by implementing Drop for CarrierFile to flush dirty blocks
- Optimize CSPRNG padding to only fill unwritten slack space
- Batch carrier initialization in 500-block transactions to prevent UI/CLI freeze
- Enforce 64-byte savings threshold for LZ4 compression
- Add WebClient service diagnostic hint for Windows net use mount errors
- Add unit and integration tests covering all new features
harald