test: update conversation assembly coverage and docs

.agents/notes/implemented/architecture/2026-07-19-gui-web-client-architecture.md

@@ -44,35 +44,35 @@ Implementation homes: registry core and the props-share types in `packages/clien
 
 A service is a plugin's only API surface toward other plugins (UI components and injection faces are not APIs; a plugin nobody calls mounts no service — ui-trajectory is the minimal-plugin exemplar: no ctx service, only view-slot registrations). The roster: `ctx.connection` (api client + stream handles), `ctx.slots` (registry wrapper emitting `slots/changed`, render entry, renderer installation contract), `ctx.sessions` (list store, current-session state, scope tree), `ctx.loader`, `ctx.theme`, `ctx.i18n`, `ctx.layout` (cross-plugin view navigation), `ctx.conversation` (send/cancel/startSession). Viewing state that used to live in service stores (panel widths, selection, drafts) now lives in entry-declared stores per the [slot system standard](2026-07-22-slot-type-chain-implementation.md).
 
-There is no registration model besides slots — the former view and tool rings both dissolved into it. Conversation views are entries of the `'conversation.view'` list slot ui-conversation declares, tab metadata rides the registration options (`id`/`order`/`label`), and per-view chrome lives inside the view components themselves. Tool presentation crosses one explicit package boundary: Runtime projects Code Dispatch topology into each root's recursive `subCalls`; ui-conversation places that ordered root into the single `'conversation.chat.tool'` seat without interpreting Tool names or topology; ui-tool renders the supplied tree and declares the keyed/session `'tool.call.toolview'` child slot. The key space stays runtime-open (SlotMap declares slots, never keys), and roots and descendants dispatch by `entryKey: toolName` with `GenericToolCard` as the fallback. Business packages register atomic views through `ctx.slots.inject('tool.call.toolview', () => ctx.slots.register({ name: 'tool.call.toolview', key: '<tool>', inject? }, Row))`; the declaration is the load and reload dependency ([decision](2026-08-05-slot-declaration-injection.md)). ui-conversation separately delegates the selected call's details body through `'conversation.details.tool'`, so ui-tool's card models remain the single presentation owner without making conversation import Tool components.
+There is no component registration model besides slots — the former view and tool rings both dissolved into it. Conversation views are entries of the `'conversation.view'` list slot ui-conversation declares, tab metadata rides the registration options (`id`/`order`/`label`), and per-view chrome lives inside the view components themselves. Final Chat business Nodes dispatch through the keyed/session `'conversation.chat.node'` slot; ui-tool owns its `tool-call` entry, recursively renders the supplied `subCalls`, and declares the keyed/session `'tool.call.toolview'` child slot. The key space stays runtime-open (SlotMap declares slots, never keys), and roots and descendants dispatch by `entryKey: toolName` with `GenericToolCard` as the fallback. Business packages register atomic views through `ctx.slots.inject('tool.call.toolview', () => ctx.slots.register({ name: 'tool.call.toolview', key: '<tool>' }, Row))`; the declaration is the load and reload dependency ([decision](2026-08-05-slot-declaration-injection.md)). ui-conversation separately delegates the selected call's details body through `'conversation.details.tool'`, so ui-tool's card models remain the single presentation owner without making conversation import Tool components. The target-neutral event and view registries are data assembly seams rather than parallel component registries ([decision](2026-08-09-client-conversation-node-assembly.md)).
 
 **Scope addressing** mirrors the host's agent-scope idiom: services are root singletons whose methods take no sessionId — they read the caller's scope mark (`scopeOf(ctx)`). Inside a session scope, `ctx.conversation.send('hi', 'queue')` targets that session; cross-session calls re-target by switching ctx (`ctx.sessions.scope(id)!.conversation.send(...)`); calling a scoped method from root ctx throws. Client session scopes are minted like host agent scopes (a no-op plugin fiber + a scope-key extend), built lazily on first viewing and torn down only when the session is removed and unwatched — host-session death alone does not tear a scope (it freezes into a read-only viewport).
 
 ## The data object layer (`packages/client/runtime/src/client/sessions/`)
 
-Frames enter, snapshots exit, the projection sits between — React-free (zero React imports, grep-assertable):
+Frames enter, snapshots exit, the Conversation assembler sits between — React-free (zero React imports, grep-assertable):
 
 ```
-mux/host 帧（ConnectionController 泵入，sinks 注入）
+mux/host frames (ConnectionController pump, injected sinks)
         │
         ▼
 SessionManager.handleMuxEnvelope / handleHostEnvelope
-        │ 带 sessionId 的帧只投已存在实例（审批/问答 requested 例外：进 pendingBuffers 缓冲）
+        │ session frames target existing instances (requested waits buffer)
         ▼
-Session.handleMuxEnvelope ──► events 窗口（seq 连续升序）
-        │                        │ 定稿事件            │ chunk
-        │                        ▼                    ▼
-        │                TranscriptAdapter     PartialAccumulator
-        │                  （→ nodes）          （→ partial）
+Session.handleMuxEnvelope ──► contiguous Event window
+        │                        │ replace / prepend / append
+        │                        ▼
+        │                ConversationNodeAssembler
+        │                  Definitions -> Contexts -> view builders
         ▼
 Notifier 微任务合批 ──► ConversationSnapshot 缓存 ──uSES──► 组件
 ```
 
 - **Session** (session.ts): lazily built, resident — once created it keeps eating frames in the background, so switching away and back renders instantly. Operations: `prompt`/`cancel` (RPC passthrough; failures land in the snapshot's `promptError`), `open` (pull the tail history page, idempotent), `loadOlder` (upward paging, reentry-guarded), `resync` (reconnect = clear the window and rerun open). Subscription: `subscribe`/`getSnapshot` (always the cached reference) — `implements ObservableSnapshot<ConversationSnapshot>`, with `useSelector = bindSnapshotSelector(this)` attached at construction, so a Session is directly a uSES source. Frame dispatch is one switch: `session/event` frames dedup by seq (the only dedup key), buffer while open is in flight, otherwise append + incremental projection; open/stitch merges the live buffer by seq and backfills once if `subscribed.lastSeq` outruns the window tail.
-- **ConversationSnapshot** (conversation.ts): the immutable snapshot contract — `nodes` (the human transcript, log-ordered), `partial`, `runningCalls`, `pending`, `running`, `removed`, `openState`, `hasMore`, `promptError` and kin. **Reference discipline** (the premise of memo and uSES): the top-level object is fresh on every change; an unchanged nodes projection keeps the same array reference, while a changed flow returns a new array that reuses unchanged element references; unchanged substructures reuse the previous snapshot's references.
+- **ConversationSnapshot** (conversation.ts): the top-level immutable snapshot contract. `chat` contains structural `order`, an identity-stable keyed Node reader, Turn/Step indexes, and the timeline; `nodes`, `partial`, `runningCalls`, `turnTimings`, and `turnEnds` are the compatibility slice for unmigrated Trajectory consumers. Pending interactions, queue, running, removal, open state, paging, and prompt errors remain Session facts. **Reference discipline** (the premise of memo and uSES): unchanged substructures and Node values keep their references; one business update replaces only the corresponding key's value unless its order or Location changes. React still subscribes to the Session as the sole observable source, while the framework-provided `useSession(selector)` isolates Node and Location aggregate updates.
 - **SessionManager** (manager.ts): instance cluster + frame entry + the session list. sessionId-bearing frames go only to existing instances (a mux broadcast must not instantiate every session); approval/question `requested` frames are the exception — they never land in history, so they buffer in `pendingBuffers` and replay on instantiation.
 - **Notifier** (notifier.ts): two channels chosen by change source. `markDirty()` (default; frame-driven changes always) batches per microtask — N changes, one notification, one re-render; the flush rebuilds the snapshot cache before notifying. `notifyNow()` (only direct echoes of user gestures) rebuilds and notifies in the same tick — controlled inputs roll the DOM back and jump the caret if their echo defers to a microtask. Frame-driven code using notifyNow collapses batching back to per-frame renders; banned.
-- **TranscriptAdapter / PartialAccumulator**: the transcript is the append-origin surface projected in log order (`isAppendSurfaceEvent` from `@deepseek-ai/dsh-session/surface`) plus one marker per landed compaction checkpoint — never the model surface, which shadows replaced ranges and would erase conversation the reader already saw. Node order is seq-monotonic by construction, so there is no core `seq === index` assertion to satisfy and no degradation branch. Chunks contribute no node (O(1) skip): the accumulator folds StreamChunks into `AssistantBlock[]`, a delta swapping only that block's reference, and the finalizing message discards the accumulator in the same batch (no flicker on promotion). Cost model: one chunk = one string concatenation + a dirty mark; an unsubscribed Session under a frame storm costs only the mark.
+- **ConversationNodeAssembler** (`runtime/src/client/conversation/`): the Session-owned incremental engine runs independently registered Definitions over raw events. `match(event)` selects `(kind, id)` without Context scans; start/update build Definition state; engine-computed Locations carry Turn/Step closure; backward Context reads record dependencies repaired by later prepends; `buildViewNode(target)` materializes only dirty Contexts. The Chat builder preserves structural order and per-key value identity, `useSession` selectors isolate consumption, and Assistant token publication coalesces to one animation frame. The [Conversation Node decision](2026-08-09-client-conversation-node-assembly.md) owns assembly, while [Tool presentation ownership](2026-08-08-client-tool-presentation-ownership.md) owns recursive Tool rendering.
 - **ConnectionController** (in `packages/client/connection`): opens the mux/host streams, pumps with for-await, reconnects with exponential backoff (500ms doubling to 10s, jitter, unlimited) behind a generation fence; sinks are injected one-way (the Controller does not know Session). Reconnect = rebuild: `onConnected` → list refresh + per-open-session resync. The object layer faces only `IApiClient`; Web carriage uses HTTP POST for the two client→server quadrants and [one WebSocket per logical stream](2026-08-04-websocket-downlink-carrier.md) for the two server→client quadrants, while the client class family remains the layering RFC's territory.
 
 ## The React face (`packages/client/web-react`)
@@ -95,6 +95,7 @@ src/client/
   contract/    shared slot and cross-domain types
   service.ts   cross-domain orchestration
   skeleton/    conversation shell and details host
+  conversation-nodes/ independently registered business Definitions and Chat builder
   chat/        ordered conversation view
   input/       composer state machine
   queue/       queued-message presentation
@@ -109,13 +110,13 @@ Domain implementation files never import a sibling domain; shared surfaces route
 
 - **A new UI feature** = a new plugin package: declare `dshClient` (+ `inject` topology) in package.json, write the browser half under `src/client/` (apply mounts services/stores and registers slots), keep the node half an empty apply unless there is host logic, build with the shared preset. Add the plugin to the host config; the manifest and loading follow automatically.
 - **A new slot**: see the [slot system standard RFC](2026-07-22-slot-type-chain-implementation.md) — merge the contract into `SlotMap`, declare it in the parent entry's `children`, render through the auto-injected `renderSlot` prop. Never export components globally.
-- **Consuming a new frame type**: sessionId-bearing → a branch in Session's dispatch switch; host-level → the Manager routing table; if the UI needs it, a `ConversationSnapshot` field with the reference discipline kept.
+- **Consuming a new frame type**: transport-only session frames → Session's dispatch switch; host-level frames → the Manager routing table; logged conversation business events → a Definition plus a keyed view renderer, without a Session business branch.
 - **Where does this state live**: business data (events, streaming, pending) → always the object layer; what the parent knows → owner props at the renderSlot site; private to one component (scroll, search text, expansion) → component state; shared across entries or surviving remounts (selection, drafts, panel widths) → an entry-declared store ([slot system standard](2026-07-22-slot-type-chain-implementation.md)).
 - **Notification channel**: frame-driven/async = `markDirty` batching; direct user-gesture echo whose controlled input needs the same tick = `notifyNow`.
 
 ## Consequences
 
-Token streams no longer shake the render tree: a frame storm costs unsubscribed sessions one dirty bit and the subscribed view one batched re-render per microtask (raf-batched for frame-driven stores). UI features load, fail, and get disabled as independent plugins — one crashing slot entry blacks out one card, one failed bundle fails loud before the UI flips in. The accepted costs: the loader/module-table machinery is bespoke infrastructure the team owns end to end; the one-flip boot (no progressive rendering) trades first-paint granularity for assembly simplicity; and the dual type programs make "which aggregate sees this file" a question developers occasionally have to answer.
+Token streams no longer shake the render tree: Assistant chunks update one business Context and publish its keyed Node at most once per animation frame; unrelated rows' selector results retain their references, so those rows do not re-render. UI features load, fail, and get disabled as independent plugins — one crashing slot entry blacks out one card, one failed bundle fails loud before the UI flips in. The accepted costs: the loader/module-table machinery is bespoke infrastructure the team owns end to end; the one-flip boot (no progressive rendering) trades first-paint granularity for assembly simplicity; and the dual type programs make "which aggregate sees this file" a question developers occasionally have to answer.
 
 ## Alternatives considered