fix(agent): align consumers with inbox lifecycle

packages/client/runtime/src/client/sessions/session.ts

@@ -654,11 +654,16 @@ export class Session implements SessionFace {
     this.applyEventSideEffects(event, view)
   }
 
-  /** Retire the first matching live steering occurrence when its durable event takes over. */
+  /** Retire the first matching live steering occurrence when its durable message takes over. */
   private handoffPendingSteering(event: SessionEvent): void {
-    if (event.type !== 'steering/message') return
+    const message = event.type === 'user/message'
+      ? event.data
+      : event.type === 'steering/message'
+        ? event.data.message
+        : undefined
+    if (message === undefined) return
     const index = this.queued.findIndex(item =>
-      item.placement === 'steering' && item.messageId === event.data.message.id)
+      item.placement === 'steering' && item.messageId === message.id)
     if (index === -1) return
     this.queued = this.queued.filter((_item, candidate) => candidate !== index)
     this.queueRev++

packages/client/runtime/tests/queue-store.spec.ts

@@ -168,6 +168,32 @@ describe('queue snapshot intake', () => {
     })
     expect(session.getSnapshot().queue.map(item => item.id)).toEqual(['s-later'])
   })
+
+  it('hands off live steering when the agent claims it as a user message', async () => {
+    const session = makeSession()
+    await session.open()
+    const message = createUserMessage({
+      content: text('claimed steering'),
+      source: { kind: 'user' },
+    })
+    session.handleMuxEnvelope(rid('env-claimed'), queueFrame([
+      { id: 's-claimed', body: '', placement: 'steering', message },
+    ]))
+
+    session.handleMuxEnvelope(rid('env-user-message'), {
+      type: 'session/event',
+      sessionId: SID,
+      event: {
+        seq: 0,
+        time: 1_700_000_000_000,
+        type: 'user/message',
+        surfaceOp: 'append',
+        data: message,
+      },
+    })
+
+    expect(session.getSnapshot().queue).toEqual([])
+  })
 })
 
 describe('queue operation transport', () => {

packages/client/ui-conversation/src/client/skeleton/ConversationRoot.tsx

@@ -145,7 +145,7 @@ export function ConversationRoot({
       {hero && <HeroGlow className={css.heroGlow} />}
       {hero && <HeroShell t={t} />}
       {hero && heroWorkspaceRow}
-      {!hero && zone !== undefined && renderSlot('conversation.input.dock', zone)}
+      {zone !== undefined && renderSlot('conversation.input.dock', zone)}
       {inputBar}
     </div>
   )