cli-v0.21.2

Fixes

• Comment selection feedback — Fixed comment selection highlighting not settling reliably when feedback animations were deferred.
• Numbered list export — Fixed DOCX export dropping XML namespaces (xmlns:w16cid, etc.) when creating a numbered list in a document that had no numbering.xml part, causing Word to refuse opening the file.
• Overlapping metadata anchors — Anchored metadata ranges now reject overlaps with existing anchors instead of silently splitting into duplicate entries; selection normalizes on removal to prevent stray carets.
• Custom XML synchronization — Metadata and customXml writes now 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 are recorded as tombstones during collaboration so remote clients don't resurrect stale parts on export; stale tombstones clear only when parts actually hydrate, not merely when local copies exist.
• Metadata payload validation — Payload serialization now fails during the attach preview instead of mid-transaction, preventing anchors from being inserted with non-serializable content (BigInt, cyclic objects).
• CI workflow — Bun is now installed in the React CI workflow so SDK contract generation can run during type checks.