diff --git a/tauri/src/runtime/app-management/app-sdk.ts b/tauri/src/runtime/app-management/app-sdk.ts
index f623ef1..f66e18d 100644
--- a/tauri/src/runtime/app-management/app-sdk.ts
+++ b/tauri/src/runtime/app-management/app-sdk.ts
@@ -115,21 +115,6 @@ export interface InteractRuntimeSDK {
 /** @deprecated Use InteractRuntimeSDK; kept for the compatibility app_scope=chat name. */
 export type ChatRuntimeSDK = InteractRuntimeSDK;
 
-/**
- * The intentionally smaller SDK granted to an installed Extension App. It
- * does not reveal another App's inbox, the focus stack, Transport, DOM root,
- * storage, credentials, or Host capabilities.
- */
-export interface ExtensionRuntimeSDK {
-  readonly app_scope: AppScope;
-  readonly instance_id: string;
-  readonly conversation_id: string;
-  listMessages(afterMessageID?: string): readonly ScopedConversationItem[];
-  acknowledgeMessage(messageID: string): boolean;
-  reportResult(result: JsonObject): Promise<CommandReceipt>;
-  reportFailure(message: string): void;
-}
-
 export type RuntimeAppEvent =
   | { type: "agent-message"; message: ScopedConversationItem }
   | { type: "local-item"; item: ConversationItem; local_id: string }
diff --git a/tauri/src/runtime/coordination/lineup-runtime.test.ts b/tauri/src/runtime/coordination/lineup-runtime.test.ts
index e316206..c9a8878 100644
--- a/tauri/src/runtime/coordination/lineup-runtime.test.ts
+++ b/tauri/src/runtime/coordination/lineup-runtime.test.ts
@@ -84,11 +84,6 @@ describe("LineUpRuntime", () => {
     const interaction = runtime.lifecycle.instances.activeFor("chat", conversationID);
     expect(interaction).toMatchObject({ state: "background" });
     expect(runtime.snapshot()?.app_inbox).toEqual([expect.objectContaining({ app_scope: "draw-and-guess", message_id: "launch-game" })]);
-    const game = runtime.openExtensionApp("draw-and-guess", "draw-and-guess:game-001");
-    expect(game.listMessages()).toEqual([expect.objectContaining({ scope: { app_scope: "draw-and-guess", conversation_id: conversationID } })]);
-    expect(await game.reportResult({ winner: "user_1" })).toMatchObject({ disposition: "accepted" });
-    expect(transport.sent.at(-1)?.payload).toContain("lineup.v1.app.result");
-
     runtime.closeAppInstance("draw-and-guess:game-001");
     expect(runtime.lifecycle.focus.foreground()).toBe(interaction?.instance_id);
     expect(runtime.lifecycle.instances.get(interaction!.instance_id)).toMatchObject({ state: "foreground" });
diff --git a/tauri/src/runtime/coordination/lineup-runtime.ts b/tauri/src/runtime/coordination/lineup-runtime.ts
index 3058ec4..f1f72f6 100644
--- a/tauri/src/runtime/coordination/lineup-runtime.ts
+++ b/tauri/src/runtime/coordination/lineup-runtime.ts
@@ -21,7 +21,6 @@ import {
   type ChatRuntimeSDK,
   type ChatViewModel,
   type CommandReceipt,
-  type ExtensionRuntimeSDK,
   type RuntimeAppEvent,
   type Unsubscribe,
 } from "@/runtime/app-management/app-sdk";
@@ -295,23 +294,6 @@ export class LineUpRuntime {
     };
   }
 
-  /** Opens a per-instance Extension projection after Runtime has started it. */
-  public openExtensionApp(appScope: AppScope, instanceID: string): ExtensionRuntimeSDK {
-    const app = this.apps.get(appScope);
-    const instance = this.lifecycle.instances.get(instanceID);
-    const conversationID = this.requireConversationID();
-    if (!app || app.kind !== "bundled" || !app.enabled || !instance || instance.app_scope !== appScope || instance.conversation_id !== conversationID) {
-      throw new Error("Bundled MiniApp SDK is unavailable for this instance.");
-    }
-    return {
-      app_scope: appScope, instance_id: instanceID, conversation_id: conversationID,
-      listMessages: afterMessageID => this.listAppMessages(appScope, afterMessageID),
-      acknowledgeMessage: messageID => this.store.acknowledgeAppInbox(appScope, messageID),
-      reportResult: result => this.queueProtocolAction("app-result", "lineup.v1.app.result", { instance_id: instanceID, app_scope: appScope, result }),
-      reportFailure: message => this.closeAppInstance(instanceID, boundedFailure(message)),
-    };
-  }
-
   /** The restricted SDK injected into a bundled MiniApp instance. */
   public openBundledMiniApp(appScope: AppScope, instanceID: string): LineUpMiniAppSDK {
     const app = this.apps.get(appScope);
@@ -1295,11 +1277,6 @@ export class LineUpRuntime {
   }
 }
 
-function boundedFailure(value: string): string {
-  const message = value.trim();
-  return message ? message.slice(0, 500) : "Extension App failed.";
-}
-
 function appSessionHistory(records: readonly StandardInteractionRecord[]): readonly { id: string; role: "agent" | "user"; text: string }[] {
   const history: Array<{ id: string; role: "agent" | "user"; text: string }> = [];
   for (const record of records) {
diff --git a/迭代/03.sdk_and_coreapp/04.acceptance_review.md b/迭代/03.sdk_and_coreapp/04.acceptance_review.md
index 0d07dd0..ba4473a 100644
--- a/迭代/03.sdk_and_coreapp/04.acceptance_review.md
+++ b/迭代/03.sdk_and_coreapp/04.acceptance_review.md
@@ -26,7 +26,7 @@
 | 🔴 | P2 | A8 | 当前 Task Dashboard/Whiteboard Surface 主要是 Host 硬编码的静态页面，无法证明真实业务 UI 在各自受限 Surface 内运行 | `main.ts:180-198`、`isolated-surface-host.ts` | 至少提供能代表业务边界的受限 Surface fixture，并验证 MiniApp 业务逻辑不能取得 Host DOM 或 Runtime 内部。 |
 | ✅ | P2 | A9 | MiniApp progress 没有进入可恢复的 Tool 状态记录 | `miniapp-tool-state.ts`、`lineup-runtime.test.ts` | 已在 Tool 记录保存最后一次 `percent/status/detail`，ConversationStore 随记录持久化；Runtime 重启后可恢复，且补充状态机和重启回归测试。 |
 | ✅ | P3 | A10 | App session 记录和 opened/closed 事件没有显式保存 `agent_id` / `conversation_id` 字段 | `lineup-runtime.ts`、`lineup-runtime.test.ts` | opened/closed 事件现在都带 `agent_id`、`conversation_id`、`app_session_id`、`instance_id`、`app_scope`；并补充生命周期回归测试。 |
-| 🔴 | P3 | A11 | 旧的 `openExtensionApp` 公开入口仍提供较宽的旁路能力 | `lineup-runtime.ts:286-300` | P3 也必须在本迭代处理：删除公开旁路，或让它只返回受统一 SDK v1 约束的适配器。 |
+| ✅ | P3 | A11 | 旧的 `openExtensionApp` 公开入口仍提供较宽的旁路能力 | `lineup-runtime.ts`、`app-sdk.ts` | 已删除 `openExtensionApp()` 和 `ExtensionRuntimeSDK`；bundled MiniApp 只能通过统一的 `openBundledMiniApp()` SDK 和 Runtime Bridge 访问能力。旧测试已改为验证统一生命周期路径。 |
 
 ## 1. 已验证通过的部分
 
@@ -96,10 +96,10 @@ Interact 仍然可以使用可信 DOM，但它的 SDK 已明确拆成两层：`s
 基础构建与自动化测试：通过
 真实登录和消息发送：通过
 App 架构边界：部分通过（A1/A2/A5/A6 已实现，A2 待浏览器复验）
-MiniApp 隔离与 SDK 规范：A1～A10 已通过，仍需处理后续 P3
+MiniApp 隔离与 SDK 规范：A1～A11 已通过。
 标准交互终态契约：通过
-迭代整体验收：不通过，继续处理 A8、A11；A2 需在最终浏览器复验中确认
+迭代整体验收：不通过，剩余 A8 真实浏览器验收；A2 也需在最终浏览器复验中确认
 ```
 
-本轮独立验收由子 agent 完成。A6 已在本轮修复并通过自动化验证，A7 已完成契约收敛并通过全量测试，A9 已完成进度持久化并通过重启回归，A10 已补齐生命周期事件上下文；下一轮继续处理 A8、A11，并重新执行
+本轮独立验收由子 agent 完成。A6 已在本轮修复并通过自动化验证，A7 已完成契约收敛并通过全量测试，A9 已完成进度持久化并通过重启回归，A10 已补齐生命周期事件上下文，A11 已删除旧 SDK 旁路；下一轮只需完成 A8 的真实浏览器验收并重新执行独立验收。
 独立验收。P2/P3 不能被静默删除，必须在本迭代结束前解决或保留明确的延期记录。