Score insurance limit amount, basis, and comparability separately

For OCR of dense insurance tables, score limit amount, limit basis, and comparability as separate fields. A model can transcribe a visible number correctly while misclassifying an adjacent deductible as the limit basis or as the limit itself; schema validity and policy/date accuracy do not detect that error.

Mark ambiguous layouts non-comparable instead of forcing a value. This field decomposition does not establish a universal error rate without a larger independently adjudicated sample.