fix(a2a): map Event.output into to_a2a artifacts - #6777
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Workflow output_schema finals are emitted as Event(output=...) with no content parts. A2A converters previously ignored output, so the final artifact kept only the last agent node's text. Serialize output into DataParts when content is absent (preserving finish_task content). Fixes google#6762
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Summary
Event.outputand nocontentparts (the shape Workflowoutput_schemafinals use), A2A converters now serialize that output into DataParts instead of dropping itevent_converterpath (used byto_a2a()) and the newerfrom_adk_eventpath are updatedFixes #6762
Root cause
to_a2a()builds the final artifact from converted ADK events. Converters only readevent.content.parts. A Workflow withoutput_schemafinishes by flushingEvent(output=<validated model>)with empty content, so the structured result never entered A2A — only earlier agent text (often the laststrnode) remained inresult.artifacts.Test plan
pytest tests/unittests/a2a/converters/test_from_adk.py tests/unittests/a2a/converters/test_event_converter.py tests/unittests/a2a/executor/test_a2a_agent_executor.pyEvent(output=Report(...))→ TaskResultAggregator final parts are the Report DataPart