NIST packet validator

Conventional bozorth3 raw threshold for "match" is 40. Normalized score is raw / afis_max_score × 100 with afis_max_score = 399; the auto-correct floor is min_score = 25 (normalized) which corresponds to raw ≈100. Same-finger same-subject bozorth3 scores typically sit between 40 and 200 depending on minutiae count and image quality. Raw < 5 means few or no minutiae overlapped — usually a slap quality or segmentation issue, not a matching issue.

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