Coder stages

Stage	Description
HuffmanStage	GPU Huffman entropy coding (PHF coarse-grained)
ANSStage	GPU rANS entropy coding (dietGPU, byte-level)
RLEStage	Run-length encoding
RZEStage	Recursive zero-byte elimination
RREStage	Repetition-reduction encoding (LC framework lossless component)
BitpackStage	Dense bit-packing of fixed-width integers
AdaptiveBitpackStage	Per-block adaptive fixed-rate bit-plane coding (cuSZp plain mode)