FX.2 Render falls back to WebGL when the GPU cannot start (Windows dxcompiler.dll error 87)

Reported by email: 'Failed to execute requestDevice on GPUAdapter: DynamicLib.Open: dxcompiler.dll Windows Error: 87' and the render stopped. The WebGPU path tracer already fell back to WebGL when GPU setup failed, but a requestDevice rejection carried no code, so the fallback never ran. pt-gpu.js and pt-denoise-gpu.js (BimCraft and ModelCraft) now tag that failure gpu_setup, so the still render drops to the WebGL engine instead of failing. The live view (ipr.js) calls the tracer without that fallback and may still show the error; not checked. Not tried on a Windows machine with the broken driver. Advice to the reporter: update the graphics driver and the browser, send chrome://gpu.