agno: workflow StepProgress event text leaks into workflow span output #862

agno 3.1.0 added a workflow StepProgressEvent (event="StepProgress", with content and data) that function steps yield during a run.

_aggregate_workflow_chunks in py/src/braintrust/integrations/agno/tracing.py appends .content from every non-WorkflowCompleted chunk to the workflow output. With agno >= 3.1.0, progress text such as "fetched 3/10" gets mixed into the workflow span's output.

Fix

• Skip chunks with event == "StepProgress" when building the output. Optionally record progress events in metadata.
• Add a focused test with a function step that yields progress (cassette-backed if it makes model calls).

Parent: #858 (found while reviewing the 2026-10-05 weekly dependency update, #849).

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