/**
 * `cortex use <local|cloud>` — flip the mode flag. The actual behavior
 * change happens in `cortex serve`, which reads the mode at spawn time.
 * Useful when the user wants to A/B between a local Cortex (development)
 * and the cloud one (production) without re-running `cortex login`.
 *
 * Switching to cloud without prior login is rejected so the user doesn't
 * end up with `serve` failing silently — the suggested fix is printed.
 */
export declare function runUse(args: string[]): Promise<number>;
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