refactor(runtime): remove legacy extension sdk bypass

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 }

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" });

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) {