/**
 * Centralized debug logger.
 *
 * By default logs only the error message (single line).
 * Set PHAIBEL_DEBUG=1 to get full stack traces.
 */
/**
 * Log a debug/error message in a compact, user-friendly format.
 *
 * In normal mode: `[phaibel:config] ENOENT: no such file or directory, open '...'`
 * In debug mode:  full stack trace (PHAIBEL_DEBUG=1)
 */
export declare function debug(tag: string, err: unknown): void;
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