parseResponse method ✓ 92.3%

  parseResponse(raw: string): FieldClassifierOutput | null {
    try {
      const match = raw.match(/\{[^{}]+\}/);
      if (!match) return null;

      const parsed = JSON.parse(match[0]) as Record<string, unknown>;

      if (
        typeof parsed.fieldType !== "string" ||
        !VALID_FIELD_TYPES.has(parsed.fieldType) ||
        typeof parsed.confidence !== "number"
      ) {
        return null;
      }

      const fieldType = parsed.fieldType as FieldType;
      const confidence = Math.max(0, Math.min(1, parsed.confidence));

      // Discard low-confidence and "unknown" results
      if (fieldType === "unknown" || confidence < CLASSIFIER_MIN_CONFIDENCE) {
        return null;
      }

      // generatorType — must be a valid FieldType; falls back to fieldType
      const generatorType =
        typeof parsed.generatorType === "string" &&
        VALID_FIELD_TYPES.has(parsed.generatorType)
          ? (parsed.generatorType as FieldType)
          : fieldType;

      return { fieldType, confidence, generatorType };
    } catch {
      return null;
    }
  },