Checkpoint web parity through Chromium input tasks

web/tests/e2e/library-link-chromium.spec.ts

@@ -0,0 +1,19 @@
+import { expect, test } from "@playwright/test";
+
+test("M12-03N runs the linked mutation gate in an independent Chromium lane", async ({ page }) => {
+  await page.goto("/");
+  const result = await page.evaluate(async () => {
+    const linked = await import("/src/library-link-chromium.ts");
+    const gate = linked.gateLinkedDataMutation({
+      schemaVersion: 1,
+      operation: "MESH_GEOMETRY",
+      dataBlockId: "Mesh/M12 Link Mesh",
+      baseRevision: 7,
+      owner: "SOURCE_LIBRARY",
+      linkedLibrary: true,
+      readOnly: true,
+    }, 7);
+    return { status: gate.status, code: gate.issues[0]?.code, recoverable: gate.issues[0]?.recoverable };
+  });
+  expect(result).toEqual({ status: "BLOCKED", code: "LINKED_DATA_MUTATION_BLOCKED", recoverable: false });
+});