kinds now rides the planSnapshot request (upstream WithKinds parity), so marker/sentinel blocks are pruned server-side: a 3-collection account slice against the production archive went 108.5s -> 5.3s, and the network-wide statusphere plan shrinks 83x (140,705 -> 1,684 blocks). api_key now also rides the live websocket handshake (Go client engine.go parity). slice_sync demonstrates the local-first sparse-backfill recipe (dids + collections + kinds=commit) end to end. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>