fix(agent): propagate SenderID in AgentEvent emitters

Expose the original acting sender ID in agent events so group-chat
telemetry and audit logs stay aligned with the real Telegram user
instead of only the group-scoped UserID.

internal/agent/loop_pipeline_tool_callbacks.go

@@ -222,6 +222,7 @@ func makeToolEmitRun(l *Loop, req *RunRequest) func(AgentEvent) {
 	return func(event AgentEvent) {
 		event.RunKind = req.RunKind
 		event.SessionKey = req.SessionKey
+		event.SenderID = req.SenderID
 		event.UserID = req.UserID
 		event.Channel = req.Channel
 		l.emit(event)