fix limiter

src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeAgent.cs

@@ -18,6 +18,14 @@ public partial class RoutingService
         if (Context.CurrentRecursionDepth > agent.LlmConfig.MaxRecursionDepth)
         {
             _logger.LogWarning($"Current recursive call depth greater than {agent.LlmConfig.MaxRecursionDepth}, which will cause unexpected result.");
+            // The caller surfaces the LAST dialog as the turn's reply, so returning here with a tool
+            // frame on top of the history would answer the user with a raw tool result. Add an
+            // explicit notice so an exhausted tool loop always ends with an assistant message.
+            var limit = RoleDialogModel.From(dialogs.Last(), role: AgentRole.Assistant,
+                content: "Stopped after reaching this agent's tool-call limit without a final answer.");
+            limit.CurrentAgentId = agent.Id;
+            dialogs.Add(limit);
+            Context.AddDialogs([limit]);
             return false;
         }