/**
 * File system persistence adapter.
 *
 * Provides file system operations with error handling.
 */
/**
 * Read a file as UTF-8 text.
 */
export declare function readFile(filePath: string): string;
/**
 * Write content to a file.
 */
export declare function writeFile(filePath: string, content: string, force?: boolean): void;
/**
 * Ensure a directory exists (recursive).
 */
export declare function ensureDir(dirPath: string): void;
/**
 * Check if a path exists.
 */
export declare function exists(p: string): boolean;
/**
 * Check if a path is a directory.
 */
export declare function isDirectory(p: string): boolean;
/**
 * Check if a path is a file.
 */
export declare function isFile(p: string): boolean;
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