fix: make property-assessor safer for whatsapp runs

skills/property-assessor/src/async-timeout.ts

@@ -0,0 +1,37 @@
+export class TimeoutError extends Error {
+  readonly timeoutMs: number;
+
+  constructor(operationName: string, timeoutMs: number) {
+    super(`${operationName} timed out after ${timeoutMs}ms`);
+    this.name = "TimeoutError";
+    this.timeoutMs = timeoutMs;
+  }
+}
+
+export async function withTimeout<T>(
+  operation: () => Promise<T>,
+  {
+    operationName,
+    timeoutMs
+  }: {
+    operationName: string;
+    timeoutMs: number;
+  }
+): Promise<T> {
+  let timer: NodeJS.Timeout | undefined;
+
+  try {
+    return await Promise.race([
+      operation(),
+      new Promise<T>((_, reject) => {
+        timer = setTimeout(() => {
+          reject(new TimeoutError(operationName, timeoutMs));
+        }, timeoutMs);
+      })
+    ]);
+  } finally {
+    if (timer) {
+      clearTimeout(timer);
+    }
+  }
+}