mcp-v0.16.2

Fixes

• Comment selection feedback — Selection highlighting no longer stutters when animations defer.
• Numbered list export — DOCX export now includes complete XML namespace declarations when creating a numbered list in a document with no existing numbering.xml part; Word accepts the exported file.
• Overlapping metadata anchors — Anchored metadata ranges reject overlaps instead of creating duplicate entries; selection normalizes on removal to prevent stray carets.
• Custom XML synchronization — Metadata and customXml writes route through part-sync, ensuring remote clients receive partChanged events and converted XML reflects deletions, late-joins, and cache invalidation correctly.
• Custom XML tombstoning — Deleted custom XML parts record as tombstones during collaboration so remote clients don't resurrect stale parts on export; stale tombstones clear only when parts actually hydrate.
• Metadata payload validation — Payload serialization validates during the attach preview instead of mid-transaction, preventing anchors from inserting with non-serializable content (BigInt, cyclic objects).