- New "Engagement security" section documenting reaction signatures,
comment signature verification, removal authorization, edit/delete
auth, and BlobHeader author verification
- Updated engagement propagation to reflect tiered pull frequency,
multi-upstream (3 max), and batched lock writes
- Documented BlobHeader as derived snapshot with tables as source of truth
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>