Developer fixes 58%-reproducible race condition in Vesuvius scroll-reading Python package

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A developer testing the open-source Vesuvius Challenge Python package on Windows 11 discovered a race condition in its shared disk cache that caused failures in 58% of test runs. The bug stemmed from a Windows file-locking incompatibility: the zarr library's write-then-replace cache commit pattern, legal on Linux, triggers an access-denied error on Windows when multiple processes try to overwrite the same file simultaneously. Any multi-worker PyTorch DataLoader using the package would randomly crash mid-training run on Windows due to this issue. The fix wraps cache write and delete operations so that permission errors degrade gracefully to cache misses rather than aborting the read, with no platform-specific code branches. After the patch, the test suite went from a 58% failure rate to zero failures across 12 consecutive runs, and the Windows test results improved from 47 passed/2 failed to 52 passed/0 failed.

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