/**
 * Compute SHA-256 hash of a file, returned as a hex string.
 */
export declare function hashFile(filePath: string): Promise<string>;
/**
 * Store a file into the workspace files directory.
 *
 * Creates a `<yyyy-mm>/` subdirectory, then tries a hard link first
 * (fast, no extra disk usage). Falls back to copyFile on error
 * (e.g. cross-device link or unsupported filesystem).
 *
 * @returns The full destination path.
 */
export declare function storeFile(src: string, filesDir: string, id: string, ext: string): Promise<string>;
/**
 * Remove a file from the workspace.
 */
export declare function removeFile(filePath: string): Promise<void>;
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