Luxar Viewer API Documentation - v2026.10.19
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    STORE_MARKERS: readonly ["zarr.json", ".zgroup", ".zattrs"] = ...

    The store-root documents that prove src is a zarr store, most likely first: a format-3 root (zarr.json, what Luxar writes today), then a format-2 group (.zgroup), then format-2 attributes alone (.zattrs).