Add n5_varlen codec for N5 varlength block format#54

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mkitti wants to merge 4 commits intozarr-developers:mainfrom

mkitti:mkitti-n5-varlen

Commits on Apr 13, 2026

Add n5_varlen codec for N5 varlength block format

mkitti
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claude
committed

Commits on May 6, 2026

Fix incorrect note: default-mode N5 header has no 4th field

mkitti
and
claude
committed
Add canonical source links to annotated binary layout section

mkitti
and
claude
committed
Rename num_bytes → numElements to match N5 spec; clarify element size

mkitti
and
claude
committed