feat(cleanup): enable 30-day session retention by default (#18854)

packages/cli/src/config/settings.ts

@@ -182,6 +182,9 @@ export interface SessionRetentionSettings {
 
   /** Minimum retention period (safety limit, defaults to "1d") */
   minRetention?: string;
+
+  /** INTERNAL: Whether the user has acknowledged the session retention warning */
+  warningAcknowledged?: boolean;
 }
 
 export interface SettingsError {