What is the bug?
Seems that some recent changes caused AG-UI agent to return extra events. Using https://github.com/jiapingzeng/agui-testsuite to test which was passing for all cases before.

Seeing extra RUN_FINISHED being returned:

❌ TEST FAILED (4832ms)
Reason: Validation failed: Multiple run termination events found: 2 RUN_FINISHED + 0 RUN_ERROR