feat(rust/sedona-raster-zarr): derive Zarr transform from spatial:bbox#975
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When a group has no explicit spatial:transform, derive a GDAL-order geotransform from spatial:bbox plus the array's own spatial shape (+ optional spatial:registration, default "pixel"). The derivation lives in the loader's transform-fallback chain, ahead of the coordinate-array path, so it uses the array shape already in hand rather than a separate, drift-prone spatial:shape attribute (bbox alone is sufficient). geozarr.rs stays a pure attribute decoder that surfaces the bbox and registration; the loader applies them. A malformed or degenerate/inverted bbox is non-fatal: it warns and falls through to the coordinate arrays (then identity), matching how a bad coordinate array is handled. When the bbox path derives a transform and the group declares no CRS, a geographic CRS is inferred from the spatial dim names, mirroring the coordinate-array path.
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