/**
 * Generate a filesystem-safe timestamp for log filenames, e.g. "2026-03-16T14-30-05".
 * Pass the date explicitly from Effect code (`DateTime.toDate(yield* DateTime.now)`).
 */
export declare function logTimestamp(d?: Date): string;
/** Wrap content in a fenced code block, using a fence that won't collide with the content. */
export declare function codeBlock(content: string, lang?: string): string;