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Adam Weidman
f1a3387160
Introduce LocalSubagentProtocol and RemoteSubagentProtocol that implement AgentProtocol, wrapping LocalAgentExecutor and A2A client streaming respectively. LocalSubagentSession and RemoteSubagentSession extend AgentSession and are the public entry points. - LocalSubagentProtocol: translates SubagentActivityEvent -> AgentEvent (THOUGHT_CHUNK->message/thought, TOOL_CALL_START->tool_request, TOOL_CALL_END->tool_response, ERROR->error). Accepts optional rawActivityCallback for rich SubagentProgress display without losing displayName/errorType detail that AgentEvent types do not carry. - RemoteSubagentProtocol: wraps A2A sendMessageStream, maintains contextId/taskId session state, tracks SubagentProgress per chunk for error recovery, and returns a ToolResult with proper SubagentProgress as returnDisplay. - LocalSubagentInvocation: now uses LocalSubagentSession internally, preserving all existing SubagentProgress display logic via rawActivityCallback. External AbortSignal wired through session.abort(). - RemoteAgentInvocation: now uses RemoteSubagentSession, subscribing to message events for live progress updates. - SubagentToolWrapper and SubagentTool: add optional onAgentEvent callback for future parent session observability (currently unused, wired through invocation constructors to avoid a second pass later). - index.ts: export LocalSubagentSession and RemoteSubagentSession. No behavioral change to SubagentProgress display or ToolResult output.