Comprehensive expert knowledge for NVIDIA DGX Spark workstation. Use when users ask about DGX Spark hardware, software, playbooks, AI Workbench, fine-tuning, inference, troubleshooting, known issues, container workflows, multi-node setup, or any development task on DGX Spark/GB10 Grace Blackwell systems. Triggers on mentions of "DGX Spark", "GB10", "Grace Blackwell desktop", "Spark workstation", or related NVIDIA AI workstation topics.