auth: bound password record verification#51
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Replace public PHC parsing and unbounded verification with verifier-owned Argon2id and scrypt password-record types. Reject hostile parameters before decoding, allocation, or KDF work, and keep raw KDFs behind valid-by-construction parameters.
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Replace public PHC parsing and unbounded verification with verifier-owned Argon2id and scrypt password-record types. Reject hostile parameters before decoding, allocation, or KDF work, and keep raw KDFs behind valid-by-construction parameters.