fix attempt

providers/base_provider.py

@@ -26,6 +26,14 @@ class RateLimiter:
         self.min_interval = 60.0 / requests_per_minute
         self.last_request_time = 0
 
+    def __getstate__(self):
+        """RateLimiter is fully picklable, return full state."""
+        return self.__dict__.copy()
+
+    def __setstate__(self, state):
+        """Restore RateLimiter state."""
+        self.__dict__.update(state)
+
     def wait_if_needed(self) -> None:
         """Wait if necessary to respect rate limits."""
         current_time = time.time()