/** Managed-block extraction and migration into the current marker format.
 * File-size sweep: split out of migration.ts.
 */
import type { LegacySurface } from './migration-inventory.js';
/** Remove only old marker blocks; callers retain unrelated content and keys. */
export declare function removeLegacyManagedBlocks(content: string): string;
/** Recover a YAML file corrupted by the historical HTML comment installer. */
export declare function deCorruptAiderYaml(content: string): string;
export declare function takeLegacyBlock(content: string): {
    body: string;
    remainder: string;
} | undefined;
export declare function writeMigratedInstructions(root: string, surface: LegacySurface, original: string, beforeWrite: ((path: string) => void) | undefined): {
    changed: boolean;
    paths: string[];
};
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