feat: pass event actions through a2a

[yarolegovich]

The changes are mostly test updates.

• If Actions.Escalate was set on a session.Event it will be passed to callers in the terminal task status update Metadata.
• RemoteAgent will set it back as Actions.Event (handled in adka2a.ToSessionEvent).

[gemini-code-assist]

Summary of Changes

Hello @yarolegovich, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new feature to reliably transmit the 'escalate' status across the Agent-to-Agent (A2A) communication boundary. This ensures that if an agent's session event is marked for escalation, this critical status is preserved and communicated to downstream callers via the terminal task status update metadata, allowing for appropriate handling and response.

Highlights

• Escalate Status Propagation: Implemented a mechanism to pass the Escalate status from session.Event.Actions through the A2A communication layer, ensuring it's included in terminal task status updates.
• A2A Message Metadata: Modified EventToMessage to serialize the Escalate flag into the a2a.Message metadata and updated ToSessionEvent to deserialize it back into session.Event.Actions.
• Event Processor Updates: The eventProcessor now tracks the Escalate status across events and ensures it is correctly included in the metadata of the final terminal task status update.
• Comprehensive Testing: Added new test cases and updated existing ones in a2a_agent_test.go, events_test.go, and processor_test.go to validate the end-to-end propagation and handling of the Escalate status.

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[gemini-code-assist]

Code Review

This pull request introduces functionality to pass an escalate status through the A2A protocol. The changes involve adding an escalate flag to the A2A message metadata when a session.Event has Actions.Escalate set. The server-side processor tracks this flag across multiple events and ensures it's included in the final terminal event. This allows the remote agent to reconstruct the escalate action correctly. The implementation is accompanied by thorough test updates, including new test cases for the escalation flow. The changes are logical and well-implemented. I have one suggestion for improving the robustness of metadata handling.