/**
 * ADF Merger — pure document merge logic and token estimation.
 *
 * Merges multiple ADF documents into one by combining sections with
 * matching keys. Provides rough token estimation for budget tracking.
 */
import type { AdfDocument } from './types';
/**
 * Merge multiple ADF documents into one.
 * Duplicate section keys are merged: lists concatenated, texts joined,
 * maps concatenated, metrics concatenated.
 */
export declare function mergeDocuments(docs: AdfDocument[]): AdfDocument;
/**
 * Rough token estimate: ~4 chars per token for English text.
 */
export declare function estimateTokens(doc: AdfDocument): number;
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