refactor(client): isolate trajectory history

packages/client/ui-conversation/tests/apply-inject.spec.tsx

@@ -34,7 +34,6 @@ function sessionFakeFor() {
   return {
     open: vi.fn(() => Promise.resolve()),
     loadOlder: vi.fn<ISession['loadOlder']>(() => Promise.resolve()),
-    loadAllHistory: vi.fn<ISession['loadAllHistory']>(() => Promise.resolve()),
     prompt: vi.fn<ISession['prompt']>(() => Promise.resolve({ ok: true, value: { accepted: true } })),
     cancel: vi.fn<ISession['cancel']>(() => Promise.resolve({ ok: true, value: { accepted: true } })),
   } satisfies SessionBehaviorOverrides

packages/client/ui-conversation/tests/chat-toolview-slot.spec.tsx

@@ -59,7 +59,6 @@ async function bench(nodes: ToolResultNode[]) {
     snapshot: { nodes },
     session: {
       loadOlder: vi.fn<ISession['loadOlder']>(),
-      loadAllHistory: vi.fn<ISession['loadAllHistory']>(),
       prompt: vi.fn<ISession['prompt']>(async () => ({ ok: true, value: { accepted: true } })),
     },
   })

packages/client/ui-conversation/tests/skeleton.spec.tsx

@@ -18,7 +18,7 @@ import { ConversationSession } from '../src/client/skeleton/ConversationSession.
 import { InputBar } from '../src/client/skeleton/InputBar.tsx'
 import type { InputBarProps } from '../src/client/skeleton/InputBar.tsx'
 import type {
-  ComposerBarOwnerProps, ConversationSessionOwnerProps,
+  ComposerBarOwnerProps,
 } from '../src/client/contract/slots.ts'
 
 /** Machine-backed wiring over a sink spy. */
@@ -88,10 +88,8 @@ function mount(
     slotCalls.push(key)
     if (key === 'conversation.hero.workspace') { pickerOwner = owner; return null }
     if (key === 'conversation.session') {
-      const sessionOwner = owner as ConversationSessionOwnerProps
       return (
         <ConversationSession
-          composer={sessionOwner.composer}
           sessionId={SID}
           SessionProvider={({ children }) => children(SID)}
           useSession={useSession}