/**
 * Managed-block merger for AIDLC install pipeline.
 *
 * Merges content into a file using delimited blocks:
 *   <!-- aidlc:begin <blockId> -->
 *   ...content...
 *   <!-- aidlc:end <blockId> -->
 *
 * Preserves all bytes outside managed blocks. Idempotent — applying
 * the same content twice yields the same result. Exactly one block
 * per blockId in the output; never duplicates.
 *
 * @module
 */
/**
 * Build the begin delimiter for a given block ID.
 */
export declare function beginDelimiter(blockId: string): string;
/**
 * Build the end delimiter for a given block ID.
 */
export declare function endDelimiter(blockId: string): string;
/**
 * Merge a managed block into file content.
 *
 * @param existing - Current file content (or empty string if file doesn't exist)
 * @param blockId - Unique block identifier
 * @param content - New content to place between delimiters
 * @returns The merged file content
 */
export declare function mergeBlock(existing: string, blockId: string, content: string): string;
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