feat(gateway): 地基③ 打通实时信号 producer→前端WS + loop 真流式 + 上行路由补全

打通前端 ws.ts 里那批死消费者事件（thinking/mood/tool_used/subagent_event/
task_output/device_update/reminder/backthink），并给 loop 接真 token 流式。

- wire.go：loop 建时传 OnStream（streamChunk 闭包把 delta 发 bus ws.stream_chunk）；
  gateway.Deps 注入 Scheduler/Tasks/Streaming；iot 接共享总线 iot.WithBus(a.bus)。
- ws_bridge.go：hub 额外订阅 iot.>/task.>/automation.>/reminder.>/cyrene.agent.*.event，
  normalizeEvent 归一为 ws.*（device_update/task_output/task_done/automation_result/
  reminder/subagent_event）；不订阅 cyrene.agent.> 以免 ask/reply 内部事件进 relay。
- ws_route.go：voice_input→ws.voice_input；subagent_ask→Scheduler.AuditContext（真实
  上下文审计，替换 pending stub）；task_output_query→Manager.TaskOutput（真实输出，
  替换空 {}）。
- server.go：新增 SubagentAuditor/TaskOutputStore 接口 + Deps.Scheduler/Tasks/Streaming。
- orchestration/auditcontext.go：Scheduler.AuditContext(full/tail/keyword)。
- task/manager.go：Manager.TaskOutput(id)。
- backthink：record() 补发 ws.backthink 事件。
- json tag 修正（device_update/reminder/task output 结构体加小写 tag + DeviceUpdate
  补 message），使前端分支能真正渲染。

实机验证：WS 握手 101、task manager ready、iot manager initialized(WithBus 生效)。
go build/vet/test 全绿；TestHubBridgeDeviceUpdate/TestHubBridgeSubagentProgress 覆盖
映射。dev 推至后续版本。

internal/runtime/task/manager.go

@@ -43,25 +43,25 @@ var (
 // reaches a terminal state. It carries everything the agent needs to consume the
 // result without a second lookup.
 type DoneEvent struct {
-	ID         string
-	Kind       Kind
-	Status     Status
-	Output     Output
-	ExitCode   int
-	Truncated  bool
-	Error      string
-	StartedAt  time.Time
-	FinishedAt time.Time
+	ID         string    `json:"id"`
+	Kind       Kind      `json:"kind"`
+	Status     Status    `json:"status"`
+	Output     Output    `json:"output"`
+	ExitCode   int       `json:"exitCode"`
+	Truncated  bool      `json:"truncated"`
+	Error      string    `json:"error,omitempty"`
+	StartedAt  time.Time `json:"startedAt"`
+	FinishedAt time.Time `json:"finishedAt"`
 }
 
 // OutputEvent is the payload published to the "task.output" subject as output
 // becomes available.
 type OutputEvent struct {
-	ID        string
-	Kind      Kind
-	Status    Status
-	Output    Output
-	Truncated bool
+	ID        string `json:"id"`
+	Kind      Kind   `json:"kind"`
+	Status    Status `json:"status"`
+	Output    Output `json:"output"`
+	Truncated bool   `json:"truncated"`
 }
 
 // Manager owns the task registry and the execution lifecycle. It owns an
@@ -230,6 +230,27 @@ func (m *Manager) Get(ctx context.Context, id string) (*Task, error) {
 	return t, nil
 }
 
+// TaskOutput returns the current output snapshot of task id for external
+// consumers (the gateway's task_output_query WS route). It never waits for the
+// task to finish: for a running background task it returns the output captured so
+// far. It wraps ErrNotFound with %w so callers can classify with errors.Is.
+func (m *Manager) TaskOutput(ctx context.Context, id string) (OutputEvent, error) {
+	if err := ctx.Err(); err != nil {
+		return OutputEvent{}, fmt.Errorf("task: output %q: %w", id, err)
+	}
+	t := m.get(id)
+	if t == nil {
+		return OutputEvent{}, fmt.Errorf("task: output %q: %w", id, ErrNotFound)
+	}
+	return OutputEvent{
+		ID:        t.ID,
+		Kind:      t.Kind,
+		Status:    t.Status(),
+		Output:    t.Output(),
+		Truncated: t.Truncated(),
+	}, nil
+}
+
 // Abort cancels the task for id. It returns ErrNotFound if there is no such task
 // and ErrAlreadyDone if the task has already finished.
 func (m *Manager) Abort(ctx context.Context, id string) error {