Agent does not work with ollama qwen2

Using ollama qwen2.5-coder:14b-instruct, I see raw response json for rename_session being rendered in the UX rather than the agent actually modifying the session name. It doesn't work with any further prompts either, same raw json response.

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| Field | Value |
| --- | --- |
| App version | 1.1.6 |
| OS | macOS 26.5.2 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Week 4 |

Start by reproducing the issue on the /chat path with ollama qwen2.5-coder:14b-instruct and observe how the rename_session response is handled. Trace the agent response flow to determine why raw JSON is rendered instead of executing the rename, then verify that renaming and subsequent prompts work normally.

索引モデルが issue の本文から書いたものです。