fix: correctly stop agents

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

core/agent/agent.go

@@ -198,6 +198,7 @@ var ErrContextCanceled = fmt.Errorf("context canceled")
 func (a *Agent) Stop() {
 	a.Lock()
 	defer a.Unlock()
+	xlog.Debug("Stopping agent", "agent", a.Character.Name)
 	a.context.Cancel()
 }