[codex] Serialize CubeK WGPU CI tests#5
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Summary
RUST_TEST_THREADS=1whencargo xtask test --ciis usedWhy
The Linux WGPU CI jobs were failing all
t4a-cubek-matmultests with CubeCL device channelRecvError. The samecargo xtask test --cicommand passes locally, and the failure pattern is consistent with the software Vulkan/WGPU runner not tolerating the test harness running all GPU tests concurrently.This keeps regular local
cargo xtask testbehavior unchanged and serializes only the CI-compatible path.Validation
cargo fmt --all --checkcargo xtask check lintcargo xtask test --ci