First commit

tests/package-contract.test.ts

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+import { describe, expect, it } from "vitest";
+import pkg from "../package.json";
+
+describe("package contract", () => {
+  it("publishes an explicit stylesheet and preserves CSS side effects", () => {
+    expect(pkg.exports["./style.css"]).toBe("./dist/design-system.css");
+    expect(pkg.sideEffects).toContain("**/*.css");
+    expect(pkg.peerDependencies.vue).toMatch(/^\^3/);
+  });
+});