diff --git a/apps/ai-game-creator-shell/tests/appSurface/harness.ts b/apps/ai-game-creator-shell/tests/appSurface/harness.ts
index dc18ea287..043c814d8 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/harness.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/harness.ts
@@ -627,6 +627,23 @@ function createPlanGddStateView(
   };
 }
 
+/**
+ * 运行态事件里的条目身份：只有 `item.started` / `item.completed` 带条目。
+ *
+ * `item.delta` 只带 itemId 不带条目，属于瞬时事件，不参与 bootstrap 回放。
+ */
+function directThreadEventItemId(
+  event: Record<string, unknown>,
+): string | null {
+  if (event.type !== 'item.started' && event.type !== 'item.completed') {
+    return null;
+  }
+  const item = event.item;
+  if (!item || typeof item !== 'object') return null;
+  const itemId = (item as Record<string, unknown>).itemId;
+  return typeof itemId === 'string' && itemId ? itemId : null;
+}
+
 function createProjectSupervisorRuntimeHarness({
   projectPath = '/tmp/authorized-game',
   sessionId = 'supervisor-session-active',
@@ -757,6 +774,18 @@ function createProjectSupervisorRuntimeHarness({
   // 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;
+  // bootstrap 的回放规则与 Rust 侧 `is_bootstrap_event` 对齐：只补"这一刻还没结束的条目"
+  // 与最新一条生命周期锚点；已完成条目、增量正文这类瞬时事件都不回放。
+  const directThreadActiveItemIds = new Set<string>();
+  const directThreadPendingEventSeqs = new Map<
+    Record<string, unknown>,
+    number
+  >();
+  let directThreadEventSequence = 0;
+  let directThreadLifecycleAnchor: {
+    seq: number;
+    event: Record<string, unknown>;
+  } | null = null;
 
   const conversationRecord = (
     role: 'user' | 'assistant',
@@ -954,12 +983,35 @@ function createProjectSupervisorRuntimeHarness({
       if (command === 'subscribe_direct_project_thread') {
         directThreadSubscriptionSequence += 1;
         directThreadSubscriptionId = `direct-thread-${directThreadSubscriptionSequence}`;
-        const events = pendingDirectThreadEvents;
+        const pending = pendingDirectThreadEvents;
         pendingDirectThreadEvents = [];
+        // 游标落在队尾：只有"还没结束的条目"与最新生命周期锚点作为 bootstrap 回放，
+        // 已完成条目与增量正文不再补发（Rust 侧 `is_bootstrap_event` 的同一口径）。
+        const replay = pending
+          .filter((event) => {
+            const itemId = directThreadEventItemId(event);
+            return Boolean(itemId && directThreadActiveItemIds.has(itemId));
+          })
+          .map((event) => ({
+            seq: directThreadPendingEventSeqs.get(event) ?? 0,
+            event,
+          }));
+        for (const event of pending) {
+          directThreadPendingEventSeqs.delete(event);
+        }
+        if (
+          directThreadLifecycleAnchor &&
+          !replay.some(
+            (entry) => entry.event === directThreadLifecycleAnchor?.event,
+          )
+        ) {
+          replay.push(directThreadLifecycleAnchor);
+        }
+        replay.sort((left, right) => left.seq - right.seq);
         return {
           subscriptionId: directThreadSubscriptionId,
           lastCompletedItemId: directThreadLastCompletedItemId,
-          events,
+          events: replay.map((entry) => entry.event),
         };
       }
       if (command === 'consume_direct_project_thread') {
@@ -1188,8 +1240,24 @@ function createProjectSupervisorRuntimeHarness({
     ...events: Array<Record<string, unknown>>
   ) => {
     for (const event of events) {
+      directThreadEventSequence += 1;
+      directThreadPendingEventSeqs.set(event, directThreadEventSequence);
       if (event.type === 'turn.started') directThreadTurnRunning = true;
       if (event.type === 'turn.completed') directThreadTurnRunning = false;
+      if (event.type === 'turn.started' || event.type === 'turn.completed') {
+        // 生命周期锚点只留最新一条，与 Thread Manager 的 `lifecycle_anchor` 一致。
+        directThreadLifecycleAnchor = {
+          seq: directThreadEventSequence,
+          event,
+        };
+      }
+      const itemId = directThreadEventItemId(event);
+      if (itemId && event.type === 'item.started') {
+        directThreadActiveItemIds.add(itemId);
+      }
+      if (itemId && event.type === 'item.completed') {
+        directThreadActiveItemIds.delete(itemId);
+      }
     }
     pendingDirectThreadEvents.push(...events);
     if (directThreadSubscriptionId) {