test: remove boilerplate tests, add placeholder

Author: prosdev

packages/core/src/index.test.ts

@@ -0,0 +1,8 @@
+import { describe, expect, it } from 'vitest';
+
+describe('Placeholder', () => {
+  it('should pass', () => {
+    expect(true).toBe(true);
+  });
+});
+