测试骨架不再重复下发 turn.started

- harness.ts 记录运行态"最新回合是否在跑"，emitDirectThreadEvents 只在生命周期事件上更新
- completeDirectThreadTurn 仅在回合没在跑时补 turn.started，避免与用例先发的事件重叠

apps/ai-game-creator-shell/tests/appSurface/harness.ts

@@ -754,6 +754,9 @@ function createProjectSupervisorRuntimeHarness({
   let pendingDirectThreadEvents: Array<Record<string, unknown>> = [];
   let directThreadHistoryItems: Array<Record<string, unknown>> = [];
   let directThreadLastCompletedItemId: string | null = null;
+  // 运行态事件里只有一个"最新回合是否在跑"的布尔：与 Thread Manager 只保留一条生命周期
+  // 锚点一致，重复 `turn.started` 在生产里不会出现。
+  let directThreadTurnRunning = false;
 
   const conversationRecord = (
     role: 'user' | 'assistant',
@@ -1184,6 +1187,10 @@ function createProjectSupervisorRuntimeHarness({
   const emitDirectThreadEvents = (
     ...events: Array<Record<string, unknown>>
   ) => {
+    for (const event of events) {
+      if (event.type === 'turn.started') directThreadTurnRunning = true;
+      if (event.type === 'turn.completed') directThreadTurnRunning = false;
+    }
     pendingDirectThreadEvents.push(...events);
     if (directThreadSubscriptionId) {
       directThreadNotifyHandler?.({
@@ -1303,7 +1310,10 @@ function createProjectSupervisorRuntimeHarness({
       at?: number;
       status?: string;
     }) {
-      const events: Array<Record<string, unknown>> = [{ type: 'turn.started' }];
+      // 生命周期锚点只有一份：回合已经在跑时不再补 `turn.started`。
+      const events: Array<Record<string, unknown>> = directThreadTurnRunning
+        ? []
+        : [{ type: 'turn.started' }];
       if (prompt.trim()) {
         events.push({
           type: 'item.completed',