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wdk-sys bindgen layout tests overflow (E0080 on threadlocaleinfostruct etc.) with the runner default LLVM (a ToT/22-dev build). windows-drivers-rs maintainers confirm released LLVM 21.1.2 builds clean (discussion #591). Install it to C:\\llvm-21 (dedicated path; client LLVM untouched); the driver-build job will set LIBCLANG_PATH there. Idempotent. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>