[Bug] final text not forwarded — agent-final-text delivery is retired

[renyinran666]

Summary

Describe the bug in one or two sentences.

Surface Area

• first-tree tree
• docs
• packaging or CI

Environment

• version or commit:
• install method:
• operating system:

Reproduction

1.聊天时交付给他一个任务，不回复任何信息
2.
3.

Expected Behavior

What should have happened?

Actual Behavior

What actually happened?

Additional Context

Logs, screenshots, and related links.