/**
 * Return the current year from the Unix timestamp in UTC as a zero-padded string.
 *
 * - Uses Temporal.Now.instant() converted to UTC zoned date time.
 * - Returns zero-padded string to 4 digits.
 * - Returns "" on failure.
 *
 * @returns current year string (zero-padded to 4 digits) or "" on failure
 *
 * @example getUnixYear() // "2024"
 * @example getUnixYear() // "" (on failure)
 */
export declare function getUnixYear(): string;