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Introduces CodecChain, a frozen dataclass that chains array-array, array-bytes, and bytes-bytes codecs with synchronous encode/decode methods. Pure compute only -- no IO, no threading, no batching. Also adds sync roundtrip tests for individual codecs (blosc, gzip, zstd, crc32c, bytes, transpose, vlen) and CodecChain integration tests. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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ChunkTransformto shardingpart of #3720
depends on #3727