CB bit operations must preserve byte masks and memory RMW

The first CB-family lift treated the bit index itself as the TEST operand and treated (HL) as an ALU lvalue. That was wrong for SM83: BIT n,r tests 1 << n, while SET n,(HL) and RES n,(HL) must load one byte, update it, and store it back.

Raw traces, ROM material, local paths, and personal data are not part of this public record.