[Feat]: How to set multi-agents in task_manager.py or agent.py

### Is your feature request related to a problem? Please describe.

There are two agents (Train and Plane)，how to set the two agents in agent.py so that the two agents can communicate.

### Describe the solution you'd like

There are two agents (Train and Plane)，how to set the two agents in agent.py so that the two agents can communicate.

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

查看 task_manager.py 和 agent.py，以了解当前的 agent 设置和通信机制。该 issue 询问如何配置多个 agent（Train 和 Plane）进行通信，但没有说明所需的交互方式。首先检查 repository 中的 A2A 协议示例，了解 agent 是如何定义和连接的。

由索引模型根据 Issue 内容生成。