Optional Phase-1b extension that adds memory-hard and bcrypt-style password hashing providers backed by BouncyCastle (Argon2id, bcrypt, scrypt) on top of the V00.71 PasswordHashProvider SPI from jCustos-core. Strictly opt-in: applications that do not depend on this module never pull in bcprov. Loading the module also does not touch the global JCA provider order — every algorithm is invoked through the BouncyCastle low-level Bouncy Castle Crypto APIs.