The context-free VRAM query used gpu_memory(), which (via NVML/nvidia-smi)
reports every physical NVIDIA card regardless of CUDA_VISIBLE_DEVICES. So the
Vulkan/Radeon engine (CUDA_VISIBLE_DEVICES="") showed the NVIDIA 3090's VRAM in
its status instead of its own AMD card.

Switch the per-engine status poll (api/app.py) and the capability probe
(broker/capabilities.py) to visible_gpu_memory(), which honours
CUDA_VISIBLE_DEVICES (index OR UUID; empty -> no CUDA cards). Add
gpu_query.amd_gpu_memory() (amdgpu sysfs, driver-free) as the fallback so the
Radeon engine reports its real card; capabilities keeps its torch-loaded guard so
the torch-free front still enumerates the whole node. Bumps to 0.1.29.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RdMufYvtTbtGDWsiZVoXce