fix(agent-loop): route next-step input during admission

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

@@ -108,11 +108,6 @@ export class Session implements ObservableSnapshot<ConversationSnapshot> {
   private dispatchesRev = 0
   private dispatchesCache: { rev: number; value: ReadonlyMap<string, readonly CodeSubCall[]> } | null = null
   private running = false
-  /** Whether a turn is open on the live stream — set on turn/start, cleared on
-   *  turn/end. A session/queued frame arriving while this is true joined the
-   *  steering FIFO; the host no longer stamps steering on the frame, so the
-   *  client derives it from the same ordered turn boundaries the host saw. */
-  private turnOpen = false
   /**
    * Sticky send marker, private input of the composerPhase derivation: set
    * synchronously before prompt()'s first await, never reset — the blank →
@@ -342,12 +337,6 @@ export class Session implements ObservableSnapshot<ConversationSnapshot> {
     switch (frame.type) {
       case 'session/event': {
         this.retireQueued(frame.event)
-        // Track turn-open state AFTER retirement (a message turn/start first
-        // claims its queued entry, then opens the turn), so a later queued
-        // frame is stamped steering iff a turn is open — the host no longer
-        // stamps it on the frame.
-        if (frame.event.type === 'turn/start') this.turnOpen = true
-        else if (frame.event.type === 'turn/end') this.turnOpen = false
         this.acceptLiveEvent(frame.event, frame.view)
         return
       }
@@ -357,7 +346,7 @@ export class Session implements ObservableSnapshot<ConversationSnapshot> {
         const key = 'rpcId' in frame.source ? String(frame.source.rpcId) : `f:${rpcId}`
         this.queued.push({
           row: { key, preview: queuePreviewOf(frame.content) },
-          steering: this.turnOpen,
+          steering: frame.steering,
           sourceJson: JSON.stringify(frame.source),
         })
         this.queueRev++

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

@@ -17,10 +17,11 @@ const text = (t: string): ContentBlock[] => [{ type: 'text', text: t }]
 const rid = (id: string): RpcId => id as RpcId
 
 /** session/queued frame with the wire-sourced rpcId key (the host prompt path). */
-function queuedFrame(body: string, rpcId: string): MuxFrame {
+function queuedFrame(body: string, rpcId: string, steering = false): MuxFrame {
   return {
     type: 'session/queued', sessionId: SID, content: text(body),
     source: { kind: 'user', rpcId: rid(rpcId) } as never,
+    steering,
   }
 }
 
@@ -42,6 +43,7 @@ describe('queue intake', () => {
       type: 'session/queued', sessionId: SID,
       content: [{ type: 'text', text: 'hi' }, { type: 'image', data: 'x' } as never],
       source: { kind: 'plugin', plugin: 'loop' },
+      steering: false,
     })
     expect(session.getSnapshot().queue).toEqual([{ key: 'f:env-2', preview: 'hi [image]' }])
   })
@@ -86,14 +88,7 @@ describe('queue retirement (host queuedMirror rules)', () => {
   it('steering/message drains the source-matched steering row only', () => {
     const session = makeSession()
     session.handleMuxEnvelope(rid('e1'), queuedFrame('普通', 'p-1')) // idle → non-steering
-    // Injection-triggered turn/start opens the turn without claiming a row, so
-    // the next queued frame is derived steering (arrived mid-turn).
-    const injection = {
-      ...ev.turnStart(0, 0),
-      data: { turn: 0, trigger: { kind: 'injection', source: { kind: 'plugin', plugin: 'x' } } },
-    } as never
-    session.handleMuxEnvelope(rid('e2'), { type: 'session/event', sessionId: SID, event: injection })
-    session.handleMuxEnvelope(rid('e3'), queuedFrame('插话', 'p-2')) // turn open → steering
+    session.handleMuxEnvelope(rid('e3'), queuedFrame('插话', 'p-2', true))
     // Loop-authored steering (different source) must not consume the user entry.
     const foreignSteering = {
       seq: 0, time: 1,
@@ -151,6 +146,19 @@ describe('queue reconnect semantics', () => {
     await session.resync()
     expect(session.getSnapshot().queue.map(r => r.key)).toEqual(['p-fresh'])
   })
+
+  it('replayed steering retires without a replayed turn/start', () => {
+    const session = makeSession()
+    session.handleMuxEnvelope(rid('e1'), { type: 'session/subscribed', sessionId: SID, lastSeq: 5 })
+    session.handleMuxEnvelope(rid('e2'), queuedFrame('重连插话', 'p-steer', true))
+    const committed = {
+      seq: 6, time: 2,
+      type: 'steering/message', surfaceOp: 'append',
+      data: { turn: 1, content: text('重连插话'), source: { kind: 'user', rpcId: rid('p-steer') } },
+    } as never
+    session.handleMuxEnvelope(rid('e3'), { type: 'session/event', sessionId: SID, event: committed })
+    expect(session.getSnapshot().queue).toEqual([])
+  })
 })
 
 describe('manager buffering of queued frames', () => {