[Requests and ideas] Display sub-agent model

**Mood:** 😊
**Category:** Requests and ideas

My main agents often delegate tasks to sub-agents. For debugging purpose and to improve my harness, I would like to know which model is actually used by sub-agents.

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| Field | Value |
| --- | --- |
| App version | 1.0.6 |
| OS | Windows 10.0.26200 |
| Theme | Fox |
| Path | /chat |
| Tenure | Week 5 |

No files or tests are named; begin with the /chat experience and investigate where sub-agent activity is shown. Done means the model actually used by each sub-agent is visible for debugging.

索引モデルが issue の本文から書いたものです。