/**
 * Plain JSON-compatible representation of a World.
 * Returned by `world.toJSON()`, consumed by `World.fromJSON()`.
 */
export interface WorldSnapshot {
  /** Entity stable ID → component map (component name → data). */
  entities: Record<string, Record<string, unknown>>;
  /** Relationship name → (source ID → target ID). */
  relationships: Record<string, Record<string, string>>;
}