DatasetHealthReport interface exported

export interface DatasetHealthReport {
  totalSamples: number;
  typeCounts: Record<string, number>;
  /** Types with fewer than `minSamplesPerType` samples */
  underrepresentedTypes: string[];
  /** Types with zero samples (from known FieldType enum) */
  missingTypes: FieldType[];
  /** Whether train/val/test sets have overlapping signals */
  hasLeakage: boolean;
  leakedSignals: string[];
}