/**
 * Excel/CSV Parser — Reads spreadsheet files into structured data
 * for the research engine to process.
 */
export interface ParsedSheet {
    sheetName: string;
    headers: string[];
    rows: unknown[][];
    rowCount: number;
    columnCount: number;
}
/**
 * Parse an Excel (.xlsx) or CSV file into structured data.
 */
export declare function parseExcel(filePath: string): Promise<ParsedSheet>;