[Intron7]

nvCOMP's __init__ loads its library with import nvidia.libnvcomp, nvidia.libnvcomp.load_library() and then
del nvidia.libnvcomp. That removes the attribute from the nvidia package but leaves the module in sys.modules, so
a later import nvidia.libnvcomp doesn't set it again. libcudf's loader (libcudf/load.py) runs exactly that import
and then nvidia.libnvcomp.load_library(). zarr-kvikio imports nvCOMP at its first GPU decode, so importing cudf, cuML
or rapids-singlecell after a GPU read raised

AttributeError: module 'nvidia' has no attribute 'libnvcomp'

The pipeline now imports nvCOMP through _nvcomp(), which puts the attribute back. It keeps
import nvidia.nvcomp as nv, which (unlike reading nvidia.nvcomp) also works while another thread's first import is
finishing.

Not covered: a libcudf loader that runs in another thread while the process imports nvCOMP for the first time
(~50 ms) can still fail, since the attribute is deleted inside nvCOMP's __init__.

Tested with this patch on an RTX PRO 6000 (CUDA 13, Python 3.14):

• test_reads_keep_cudf_importable fails without the fix and passes with it.
• The full suite passes on this branch (423 passed, 5 skipped, 4 xfailed).
• A GPU decode followed by import rapids_singlecell raised before and works now.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.77%. Comparing base (1004757) to head (332a78d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
+ Coverage   96.76%   96.77%   +0.01%     
==========================================
  Files           6        6              
  Lines        1175     1180       +5     
==========================================
+ Hits         1137     1142       +5     
  Misses         38       38              

Flag	Coverage Δ
gpu	96.61% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/zarr_kvikio/_pipeline.py	97.36% <100.00%> (+0.01%)	⬆️

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