Integrate OpenHandoff factory workspace

factory/packages/backend/test/setup.ts

@@ -0,0 +1,9 @@
+// Suppress RivetKit traces driver flush errors that occur during test cleanup.
+// These happen when the traces driver tries to write after actor state is unloaded.
+process.on("unhandledRejection", (reason) => {
+  if (reason instanceof Error && reason.message.includes("state not loaded")) {
+    return;
+  }
+  // Re-throw non-suppressed rejections
+  throw reason;
+});