Remove non-configurable sessionRetention container from settings docs

Author: afarber

docs/cli/settings.md

@@ -20,15 +20,14 @@ they appear in the UI.
 
 ### General
 
-| UI Label                        | Setting                            | Description                                                                  | Default     |
-| ------------------------------- | ---------------------------------- | ---------------------------------------------------------------------------- | ----------- |
-| Preview Features (e.g., models) | `general.previewFeatures`          | Enable preview features (e.g., preview models).                              | `false`     |
-| Vim Mode                        | `general.vimMode`                  | Enable Vim keybindings.                                                      | `false`     |
-| Disable Auto Update             | `general.disableAutoUpdate`        | Disable automatic updates.                                                   | `false`     |
-| Enable Prompt Completion        | `general.enablePromptCompletion`   | Enable AI-powered prompt completion suggestions while typing.                | `false`     |
-| Debug Keystroke Logging         | `general.debugKeystrokeLogging`    | Enable debug logging of keystrokes to the console.                           | `false`     |
-| Session Retention               | `general.sessionRetention`         | Settings for automatic session cleanup. This feature is disabled by default. | `undefined` |
-| Enable Session Cleanup          | `general.sessionRetention.enabled` | Enable automatic session cleanup.                                            | `false`     |
+| UI Label                        | Setting                            | Description                                                   | Default |
+| ------------------------------- | ---------------------------------- | ------------------------------------------------------------- | ------- |
+| Preview Features (e.g., models) | `general.previewFeatures`          | Enable preview features (e.g., preview models).               | `false` |
+| Vim Mode                        | `general.vimMode`                  | Enable Vim keybindings.                                       | `false` |
+| Disable Auto Update             | `general.disableAutoUpdate`        | Disable automatic updates.                                    | `false` |
+| Enable Prompt Completion        | `general.enablePromptCompletion`   | Enable AI-powered prompt completion suggestions while typing. | `false` |
+| Debug Keystroke Logging         | `general.debugKeystrokeLogging`    | Enable debug logging of keystrokes to the console.            | `false` |
+| Enable Session Cleanup          | `general.sessionRetention.enabled` | Enable automatic session cleanup.                             | `false` |
 
 ### Output