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A per-conversation message queue (new message-queue extension) holds user
messages enqueued while a turn generates; delivered mid-turn as steering at the
tool-result boundary (or carried to a new turn if no tool call fires).
- kernel: RunTurnInput.drainSteering callback (generic; kernel stays pure)
- wire 0.7.0->0.8.0: QueuedMessage, QueuePayload, TurnSteeringEvent (additive)
- transport-contract 0.11.0->0.12.0: POST /conversations/:id/queue + chat.queue WS op
- message-queue ext: queue state + per-conversation custom surface (rendererId message-queue)
- session-orchestrator: enqueue facade + drainSteering wiring + post-seal carry
- transport-http/ws: queue endpoint + chat.queue op (fixes WsClientMessage exhaustive switch)
- host-bin: register message-queue
1043 vitest + 199 transport bun pass; tsc/biome clean; boot smoke clean.
FE courier: frontend-message-queue-handoff.md.
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A turn no longer dies when its WebSocket connection closes. The turn-broadcast
hub moves into the core (session-orchestrator): turns run detached, persist at
seal regardless of clients, and fan out AgentEvents to N subscribers per
conversation with in-flight buffer replay for late-joiners. transport-ws stops
aborting turns on socket close and gains chat.subscribe/chat.unsubscribe so a
second device (or a reloaded browser) can watch a running turn.
- @dispatch/transport-contract 0.6.0->0.7.0: chat.subscribe/chat.unsubscribe WS ops
- session-orchestrator: startTurn/subscribe/isActive; persistent subscribers +
per-turn buffer (two-map model); handleMessage = convenience wrapper (no signal)
- transport-ws: per-connection chat-subscription fan-out; no turn-abort-on-close
- transport-http: test fakes updated for the widened interface (runtime unchanged)
- design notes/turn-continuity-design.md; FE courier frontend-turn-continuity-handoff.md
Live-verified vs flash (2-client WS): sender disconnect mid-turn -> other client
streams to done + turn persists; late-join replays turn from turn-start. 891 vitest
+ transport bun green; tsc -b EXIT 0; biome clean.
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cache-warming controls
Extend the surface framework so cache-warming exposes per-conversation controls:
- ui-contract: add NumberField (settable free-value numeric) to SurfaceField;
add optional conversationId to subscribe/unsubscribe/invoke + surface/update
- surface-registry: SurfaceContext { conversationId? } on getSpec/invoke (backward-compatible)
- transport-ws: thread conversationId; key subscriptions by (surfaceId, conversationId);
tag surface/update replies with conversationId
- cache-warming: per-conversation surface — Toggle(enabled) + Number(interval seconds,
cache-warming/set-interval) + Stat(last cache %); drop the currentConversationId closure
Global surfaces (surface-loaded-extensions) unchanged. 784 vitest + 109 bun = 893 tests;
tsc -b EXIT 0; biome clean.
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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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