fix: restore A2A inbound metadata and handle metadata-only events#5205
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enjoykumawat wants to merge 1 commit intogoogle:mainfrom
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fix: restore A2A inbound metadata and handle metadata-only events#5205enjoykumawat wants to merge 1 commit intogoogle:mainfrom
enjoykumawat wants to merge 1 commit intogoogle:mainfrom
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The inbound converters in to_adk_event.py only restored `actions` from A2A metadata, silently dropping `custom_metadata`, `usage_metadata`, `error_code`, and `grounding_metadata`. Additionally, `_create_event()` returned None for metadata-only messages with no parts or actions. Add `_extract_event_metadata()` to restore these fields from A2A metadata and update `_create_event()` to accept and apply them. Metadata-only messages now correctly produce a valid Event.
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Summary
custom_metadataand other event metadata fields from A2A inbound messages that were silently dropped during conversion_create_event()to return a validEventwhen metadata is present but there are no content parts or actionsRoot Cause
convert_a2a_message_to_event()only restoredactionsfrom A2A metadata. All other ADK event metadata fields were silently dropped._create_event()returnedNonefor metadata-only messages.Test Plan
custom_metadatarestoration from A2A metadataFixes #5185