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>

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")]
   }