test: isolate BlueBubbles shard under parallelism

extensions/microsoft/speech-provider.test.ts

@@ -3,6 +3,13 @@ import os from "node:os";
 import path from "node:path";
 import type { OpenClawConfig } from "openclaw/plugin-sdk/config-runtime";
 import { afterEach, describe, expect, it, vi } from "vitest";
+
+vi.mock("node-edge-tts", () => ({
+  EdgeTTS: class {
+    async ttsPromise(): Promise<void> {}
+  },
+}));
+
 import {
   buildMicrosoftSpeechProvider,
   isCjkDominant,

test/vitest/vitest.extension-bluebubbles.config.ts

@@ -17,6 +17,7 @@ export function createExtensionBlueBubblesVitestConfig(
     {
       dir: "extensions",
       env,
+      isolate: true,
       name: "extension-bluebubbles",
       passWithNoTests: true,
       setupFiles: ["test/setup.extensions.ts"],