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Add chat WS ops (chat.send / chat.delta / chat.error) + unified
WsClientMessage/WsServerMessage unions to @dispatch/transport-contract
(imports ui-contract; surface protocol unchanged — additive non-colliding
type variants, no channel wrapper). transport-ws drives
sessionOrchestrator.handleMessage, streaming each AgentEvent as chat.delta
over the same connection that carries surface ops; per-connection
AbortController cancels in-flight turns on socket close; error-isolated.
Verified live: one WS connection delivered the surface catalog AND a real
flash chat turn (chat.delta stream, reply 'Hello my friend').
Completes the FE Slice 2 backend prereqs. typecheck clean, 485 vitest + 80 bun,
biome clean.
Discovered (separate, pre-existing): runtime does not emit
turn-start/done/turn-sealed on either transport — needed for FE cache-commit;
tracked in tasks.md.
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split (B2)
FE slice 1 — backend-declared, frontend-agnostic surface system (verified live): new types-only @dispatch/ui-contract (SurfaceSpec / field kinds / region / ActionRef / catalog), surface-registry (typed service handle), transport-ws (Bun WS :24205, path-agnostic upgrade), surface-loaded-extensions (first real surface); kernel HostAPI.getExtensions; host-bin wiring; bin/up. Harness: retire AGENTS 'backend only', ORCHESTRATOR §3/§7/§8, frontend-design.md locked.
B2 — wire-types split (chat-slice prerequisite): new types-only @dispatch/wire single-sources the wire ABI (AgentEvent + 11 variants; conversation model Chunk/ChatMessage/Role/TurnId/StepId + 6 chunk variants; Usage) with zero @dispatch/* deps. @dispatch/kernel re-exports via shims so its public surface is byte-identical (zero consumer blast radius). transport-contract re-exports AgentEvent from @dispatch/wire and drops its @dispatch/kernel dependency, so HTTP clients (the web frontend) consume the wire without the kernel runtime.
tsc -b + biome clean; 460 vitest + 77 bun pass.
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