Constant DIAG_PARAM_STUCK 

pub const DIAG_PARAM_STUCK: u8 = 0xFE; // 254u8

Moved to psx_io::cd::reader. Kept at this path for one stage so psx_pack::cd::SectorReader still resolves; a re-export cannot carry a deprecation. SectorReader::diagnostics cause byte: the parameter FIFO never freed up.