Additive, Agora-only SDK features with no upstream Replyke counterpart — end-to-end-encrypted Secure Chat (blind MLS / RFC 9420), the Social Graph lenses, and web auth ergonomics that drop into @agora-sdk apps.
KOTVA — the sovereign substrate: a narrow-waist protocol family (identity, signed objects, transport, pub/sub, sync) with mail (DMTAP), commerce (TRACT) and work (WRAP) as profiles. No token.