Restructure: scsi/ and aacs/ as module directories
- scsi.rs → scsi/mod.rs (trait, constants, CDB builders) + scsi/linux.rs (SG_IO) Ready for scsi/macos.rs and scsi/windows.rs when needed. - aacs.rs + aacs_handshake.rs → aacs/mod.rs (keys, decrypt) + aacs/handshake.rs (SCSI auth) - All internal refs use super:: within module, crate:: across modules - Zero warnings, 31 tests passing
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