perf: phased codecpipeline#3885

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d-v-b wants to merge 13 commits intozarr-developers:mainfrom

d-v-b:perf/prepared-write-v2

Commits on Apr 7, 2026

feat: define `PreparedWrite` and `SupportsChunkPacking` data structures
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Merge branch 'main' of https://github.com/zarr-developers/zarr-python into perf/prepared-write-v2
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feat: new codec pipeline that uses sync path
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