feat(gui): add ask-user question composer

packages/client/runtime/tests/fake-api.ts

@@ -2,7 +2,7 @@
 // data source on a real clock; behavior tests need per-case responses and
 // deferred-controlled timing). Streams are hand pumps: pushMux/pushHost.
 import type {
-  HostFrame, IApiClient, MuxFrame, RpcError, RpcRequest, RpcResponse, SessionId,
+  ClientResponse, HostFrame, IApiClient, MuxFrame, RpcError, RpcReceipt, RpcRequest, RpcResponse, SessionId,
 } from '@deepseek-ai/dsh-client-connection/client'
 import { RpcId } from '@deepseek-ai/dsh-client-connection/client'
 
@@ -54,6 +54,7 @@ export class FakeApiClient implements IApiClient {
   onCancel: (payload: unknown) => Promise<RpcResponse<{ accepted: true }>> = () => Promise.resolve(ok({ accepted: true as const }))
   onDescribe: (payload: unknown) => Promise<RpcResponse<{ version: string; cwd: string; attachedSessions: number }>> =
     () => Promise.resolve(ok({ version: '0-fake', cwd: '/f', attachedSessions: 0 }))
+  onRespond: (message: ClientResponse) => Promise<RpcReceipt> = () => Promise.resolve({ accepted: true })
 
   private readonly muxConns: StreamConn<MuxFrame>[] = []
   private readonly hostConns: StreamConn<HostFrame>[] = []
@@ -93,8 +94,8 @@ export class FakeApiClient implements IApiClient {
     host: (_payload: unknown, signal: AbortSignal, onOpen?: () => void) => this.openStream(this.hostConns, signal, onOpen),
   }
 
-  respond(): Promise<{ accepted: false; reason: 'not-pending' }> {
-    return Promise.resolve({ accepted: false, reason: 'not-pending' })
+  respond(message: ClientResponse): Promise<RpcReceipt> {
+    return this.record('respond', message, this.onRespond(message))
   }
 
   /** Push one mux frame to every open mux stream (rpcId minted unless pinned by the case). */

packages/client/runtime/tests/session.spec.ts

@@ -251,6 +251,30 @@ describe('pending interactions', () => {
     session.handleMuxEnvelope('ry' as never, { type: 'question/resolved', sessionId: SID, questionRpcId: 'rq' as never, outcome: 'answered' })
     expect(session.getSnapshot().pending).toEqual([])
   })
+
+  it('backfills the requested rpcId for structured answers and explicit cancellation', async () => {
+    const { api, session } = makeSession()
+    await session.answerQuestion('rq-answer' as never, {
+      answers: [{ id: 'mode', selected: ['Fast'] }],
+    })
+    await session.cancelQuestion('rq-cancel' as never)
+    expect(api.callsOf('respond')).toEqual([
+      {
+        type: 'client-response', rpcId: 'rq-answer',
+        result: {
+          ok: true,
+          value: { sessionId: SID, answer: { answers: [{ id: 'mode', selected: ['Fast'] }] } },
+        },
+      },
+      {
+        type: 'client-response', rpcId: 'rq-cancel',
+        result: {
+          ok: false,
+          error: { code: 'cancelled', message: 'the user closed this question request', details: {} },
+        },
+      },
+    ])
+  })
 })
 
 describe('remaining branches', () => {