test(harness): support node-side control plane specs

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

packages/ui/src/test/setup.ts

@@ -7,9 +7,12 @@ import { matchesMediaQuery, resetAccessibilityPreferences } from "./a11y";
 
 afterEach(() => {
   resetAccessibilityPreferences();
+  if (typeof document !== "undefined") {
     cleanup();
+  }
 });
 
+if (typeof window !== "undefined" && typeof MouseEvent !== "undefined") {
   class ResizeObserverMock {
     observe() {}
     unobserve() {}
@@ -65,3 +68,4 @@ Object.defineProperty(window.HTMLElement.prototype, "setPointerCapture", {
     configurable: true,
     value: vi.fn()
   });
+}

vitest.config.ts

@@ -49,7 +49,7 @@ export default defineConfig({
   test: {
     clearMocks: true,
     environment: "jsdom",
-    include: ["packages/ui/src/**/*.test.{ts,tsx}"],
+    include: ["packages/ui/src/**/*.test.{ts,tsx}", "scripts/harness/**/*.test.ts"],
     restoreMocks: true,
     setupFiles: [path.resolve(rootDir, "packages/ui/src/test/setup.ts")]
   }