v1.44.2

Fixes

• Comment selection feedback timing — Verify pending SELECTED events are properly deferred and cancelled instead of racing with rendered highlights; drop superseded events.
• Metadata anchor validation — Reject overlapping anchored-metadata ranges (INVALID_TARGET) instead of silently creating duplicate content controls; normalize selection on remove to prevent stale carets.
• Custom XML synchronization — Route metadata and customXml writes through the parts mutation layer so partChanged fires and part-sync publishes correctly across clients.
• Custom XML tombstone handling — Record tombstones for deleted custom XML parts on remote deletes and late-join; clear stale tombstones when parts are recreated or hydrated from authoritative state.
• Bibliography cache invalidation — Invalidate converter caches when custom XML paths are written or hydrated, preventing export from rebuilding parts with stale cached content.
• Metadata payload validation — Validate payload serializability during attach preview (before document mutation) rather than inside the part-sync sandbox, preventing orphaned content controls on serialization failure.