OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd

Offscreen renderer for the draft OPC UA Vision companion server: renders a stage camera prim's view through the OpenUSD Silk backend (D3D12 hardware, D3D12 WARP software, or Vulkan headless), returns encoded PNG frames through a small ISceneCameraCaptureProvider abstraction, and reports a clear result when no graphics backend is available so the Vision server can degrade to a non-rendering sensor.