chore: import upstream snapshot with attribution

packages/core/test/fixtures/dynamic-task-module.mjs

@@ -0,0 +1,19 @@
+// Fixture mimicking a task entrypoint file: top-level code calls into the
+// catalog (the same way `task()` / `schemaTask()` does via
+// `registerTaskMetadata`).
+//
+// Loaded via `await import()` from inside a test that simulates the worker
+// running a task. The point is to exercise top-level evaluation through Node's
+// ESM module loader so the module-cache semantics are real.
+
+const register = globalThis.__catalogRegisterTaskMetadata;
+if (typeof register === "function") {
+  register({
+    id: "lazy-task",
+    fns: {
+      run: async () => "ok",
+    },
+  });
+}
+
+export const lazyTask = { id: "lazy-task" };