The multi-GPU placement (replicate threads pinned with pin_gpu) and the
second-validation memory rule read RigidBodyGPUPool and get_gpu_count(),
which a build without CUDA does not have; both are now inside
JFJOCH_USE_CUDA, where the pool can exist at all. Nothing changes in a
CUDA build. Non-CUDA rugnux and jfjoch_test build; [ModelValidation] 22
cases pass there.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SVmAWnzCmRKAXVUCdc4iNi