Persist Reasoning Effort between sessions

Describe the feature or problem you'd like to solve

Preserve not only the model but the reasoning effort to be used.

Proposed solution

I’d like the reasoning effort setting to persist across restarts as a default. Today, /config model persists, but the effort resets to Medium even after setting High in /settings. This makes it impossible to define a default high-effort profile for all sessions. Please prioritize making effort part of the persisted app settings.

Example prompts or workflows

Use the CLI’s config command to set the default reasoning effort:

• User default:  /config reasoning-effort high 
• Repo-only default:  /config --repo reasoning-effort high 
• Local-only default:  /config --local reasoning-effort high 

If you want to confirm current settings, run:

•  /config 

This changes the default reasoning effort for future sessions; the current session can be adjusted with  /model  or the session settings UI if needed.

Additional context

No response

追蹤 CLI 的 /config 命令和持久化的 app-settings 路徑，先了解現有 model 值如何在重新啟動後保留。測試 user、--repo 和 --local 這些 reasoning-effort 值，在每次檢查之間重新啟動，並確認 /config 將它們回報為預設值，同時目前工作階段的設定仍然保持獨立。