1. CUDA_ERROR_STUB_LIBRARY: ci-builder image has CUDA stubs ahead of
real NVIDIA driver libs in LD_LIBRARY_PATH. Prepend
/usr/local/nvidia/lib64 (device-plugin mount) so real driver is
found first.
2. Git checkout: `git checkout --force main` stays on local main
without pulling. Add `git reset --hard origin/$REF` to fast-forward
branch to latest remote commit.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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