[v0.3+] test: Verify Driver-Only Runtime on Clean Systems

[m96-chan]

Parent Issue

Part of #49 (Eliminate CUDA Toolkit dependency)

Goal

Verify PyGPUkit works on systems with only NVIDIA GPU drivers installed (no CUDA Toolkit).

Tasks

Windows Testing

• Test on clean Windows 11 VM (only GPU driver installed)
• Verify nvcuda.dll is found from GPU driver
• Verify bundled NVRTC DLLs load correctly
• Test all operations: GPUArray, matmul, JIT kernels

Linux Testing

• Test on clean Ubuntu 22.04 (only nvidia-driver package)
• Verify libcuda.so is found from driver
• Verify bundled libnvrtc.so loads correctly
• Test all operations: GPUArray, matmul, JIT kernels

Documentation

• Document minimum GPU driver version for Windows
• Document minimum GPU driver version for Linux
• Add troubleshooting section for driver-related errors
• Update README with "no CUDA Toolkit required" messaging

Test Environments

OS	Driver Source	Expected Result
Windows 11	GeForce Experience / nvidia.com	Works
Windows 10	GeForce Experience / nvidia.com	Works
Ubuntu 22.04	apt install nvidia-driver-535	Works
Ubuntu 20.04	apt install nvidia-driver-535	Works

Minimum Driver Versions

To be determined during testing:

• Windows: TBD (likely 520.xx+)
• Linux: TBD (likely 520.xx+)

Acceptance Criteria

• All tests pass on Windows without CUDA Toolkit
• All tests pass on Linux without CUDA Toolkit
• Documentation updated with driver requirements
• CI includes driver-only test job

Dependencies

• [v0.2.4] Make NVRTC Optional (No Bundling) #50 (Ship NVRTC in Wheel) must be completed first

Labels

testing v0.2.4 documentation