fix: remove stale Twins Lab demo link

lib/portfolio-data.test.ts

@@ -28,7 +28,7 @@ describe("getFeaturedProjects", () => {
       result.find(({ id }) => id === "sev-modaintima")?.demoCheckedAt,
     ).toBe("2026-07-10T12:00:00.000Z");
     expect(result.find(({ id }) => id === "twins-lab")?.demoAvailability).toBe(
-      "unknown",
+      "none",
     );
     expect(
       result.find(({ id }) => id === "twins-lab")?.demoCheckedAt,
@@ -86,4 +86,9 @@ describe("factual portfolio records", () => {
       /produç|clientes?|leads?|ranking|performance|resultado comercial|anime\.js|shadcn/i,
     );
   });
+  it("does not publish the unavailable Twins Lab demo", () => {
+    expect(
+      portfolio.projects.find((item) => item.id === "twins-lab")?.demoUrl,
+    ).toBeUndefined();
+  });
 });