Fix typo in handoff event name from 'handoff_occured' to 'handoff_occurred'

Author: Rehan-Ul-Haq

src/agents/_run_impl.py

@@ -884,7 +884,7 @@ def stream_step_result_to_queue(
             elif isinstance(item, HandoffCallItem):
                 event = RunItemStreamEvent(item=item, name="handoff_requested")
             elif isinstance(item, HandoffOutputItem):
-                event = RunItemStreamEvent(item=item, name="handoff_occured")
+                event = RunItemStreamEvent(item=item, name="handoff_occurred")
             elif isinstance(item, ToolCallItem):
                 event = RunItemStreamEvent(item=item, name="tool_called")
             elif isinstance(item, ToolCallOutputItem):

src/agents/stream_events.py

@@ -31,7 +31,7 @@ class RunItemStreamEvent:
     name: Literal[
         "message_output_created",
         "handoff_requested",
-        "handoff_occured",
+        "handoff_occurred",
         "tool_called",
         "tool_output",
         "reasoning_item_created",