Docs build fails locally without functional CUDA driver

[ChrisRackauckas-Claude]

The full docs build currently fails on a clean origin/master checkout when run on a machine without a functional CUDA driver. This came up while verifying an unrelated API documentation coverage PR.

Reproduction on clean base:

git worktree add ../DiffEqGPU.jl-master-check origin/master
cd ../DiffEqGPU.jl-master-check
timeout 3600 /home/crackauc/.juliaup/bin/julia +1.10 --project=docs --startup-file=no -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'\ntimeout 3600 /home/crackauc/.juliaup/bin/julia +1.10 --project=docs --startup-file=no docs/make.jl\n```\n\nObserved on base commit: `b2c4cb4` (`Update LinearSolve requirement 4.2 (#470)`).\n\nRepresentative failures:\n\n```text\nCUDA driver not functional\n...\nERROR: LoadError: `makedocs` encountered errors [:linkcheck, :example_block] -- terminating build before rendering.\n```\n\nThe base run produced `CUDA driver not functional` from multiple existing `@example` blocks that construct `CuArray`s or use `EnsembleGPUArray`/`EnsembleGPUKernel` with `CUDA.CUDABackend()`. It also hit a transient linkcheck 429 for `https://github.com/SciML/ColPrac/blob/master/README.md`.\n\nBisect note: I did not run a source-code bisect for the CUDA-driver failures because the primary failure mode is the local execution environment lacking a functional CUDA driver; this is expected to reproduce independent of the checked-out source commit on this machine.\n\nNo docs examples were skipped or silenced in the unrelated PR.

[ChrisRackauckas-Claude]

The same environment failure also blocks the full package test suite on clean origin/master.

Reproduction:

cd ../DiffEqGPU.jl-master-check
timeout 3600 /home/crackauc/.juliaup/bin/julia +1.10 --project=. --startup-file=no -e 'using Pkg; Pkg.instantiate(); Pkg.test()'\n```\n\nObserved result:\n\n```text\nGPU Kernelized Stiff ODE Mass Matrix: Error During Test\nLoadError: CUDA driver not functional\n...\nERROR: Package DiffEqGPU errored during testing\n```\n\nThis reproduced on the same base commit `b2c4cb4`. As with the docs failure, this is not meaningfully bisectable on this machine because the failing condition is the absence of a functional CUDA driver rather than a source change in the checked-out commit.

[ChrisRackauckas]

The docs require a GPU, it's not even worth trying on a machine without one.