export interface MigrationV3Options {
    projectRoot: string;
    globalSteps: Set<string>;
    services: Array<{
        name: string;
    }>;
}
/**
 * Migrate v2 root state to v3 service-sharded layout.
 * - Acquires global lock
 * - Rejects if in_progress is non-null
 * - Rejects if globalSteps is empty (prevents mis-sharding)
 * - Splits steps by globalSteps set
 * - Creates per-service state files (duplicates completed per-service steps to ALL services)
 * - Updates root state (global steps only, extra-steps preserved)
 * - Releases global lock
 *
 * Idempotent: no-op if root state is already v3.
 * Crash-safe: service files written first, root updated last.
 */
export declare function migrateV2ToV3(options: MigrationV3Options): void;
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