/**
 * PDF text extraction and structural repair module (ADR-0006).
 *
 * Hybrid architecture:
 *   1. Opportunistic system delegation to `pdftotext` and `qpdf` when installed.
 *   2. Self-contained pure-Node fallback using zlib stream inflation and
 *      PDF text operator extraction (BT/ET, Tj, TJ, Td, hex strings) so Scoutline
 *      runs without mandatory system dependencies.
 */
/**
 * Check whether a buffer begins with a valid PDF header (%PDF-).
 */
export declare function isPdfBuffer(buffer: Buffer): boolean;
/**
 * Extract text from a PDF buffer using opportunistic delegation or pure-Node fallback.
 */
export declare function extractPdfText(buffer: Buffer, timeoutMs?: number): Promise<string>;
/**
 * Attempt structural repair on damaged PDFs (e.g. broken xref table).
 */
export declare function repairPdf(buffer: Buffer, timeoutMs?: number): Promise<Buffer>;
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