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Implement the transparent compression codec ops for XPRESS (4K, 8K, 16K) and LZX (32K) algorithms. The xpress_scratch_size, lzx_scratch_size, xpress_decompress_chunk, and lzx_decompress_chunk wrappers provide unified interfaces and use per-call dynamic scratch state allocation (avoiding global mutexed singletons). Signed-off-by: Hyunchul Lee <[email protected]> Signed-off-by: Namjae Jeon <[email protected]>