fix(build): serve stable aliases for lazy plugin runtimes

packages/cli/test/plugin-runtime-production.test.ts

@@ -83,6 +83,10 @@ export default {
     const asset = await fetch(`http://127.0.0.1:${port}${assetPath}`);
     expect(asset.status).toBe(200);
     expect(await asset.text()).toContain("window.__runtimeFixture = true");
+    const lazyAsset = await fetch(`http://127.0.0.1:${port}/__wrnexus/assets/runtime-fixture.js`);
+    expect(lazyAsset.status).toBe(200);
+    expect(await lazyAsset.text()).toContain("window.__runtimeFixture = true");
+    expect(lazyAsset.headers.get("cache-control") ?? "").not.toContain("immutable");
   } finally {
     proc.kill();
     await proc.exited;