/**
 * Fetches the latest version of @planu/cli from the npm registry.
 * Uses in-memory cache to avoid redundant network calls within the same session.
 * Returns null on timeout or any network error.
 */
export declare function fetchLatestVersion(): Promise<string | null>;
/**
 * Clears the in-memory version cache.
 * Exposed for testing purposes only.
 */
export declare function clearVersionCache(): void;
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