docs: research ComfyUI on ROCm and Vulkan for Strix Halo (gfx1151)

Live-verified on Dankclaw 2026-08-14:
- official rocm/comfyui image is built PYTORCH_ROCM_ARCH=gfx942;gfx950
  (datacenter only) -> torch.cuda.is_available() False on gfx1151
- AMD gfx1151-tagged PyTorch build (rocm/vllm:...gfx1151...pytorch_2.9.1)
  -> avail True, Radeon 8060S, cap (11,5); needs /dev/kfd + /dev/dri
- torch.backends.vulkan is compiled out of standard wheels; no ComfyUI
  --vulkan flag exists; Vulkan is a dead end for ComfyUI
- Lemonade Server does image gen via wrapped stable-diffusion.cpp, whose
  HIP kernels include gfx1151 -> works where ComfyUI's torch cannot

New pages: ComfyUI ROCm and Vulkan, Lemonade and sd.cpp; ComfyUI.md
qualified; compose stays --cpu until a gfx1151-enabled torch image is built

docs/index.md

@@ -55,6 +55,8 @@ This repository tracks the container stacks for both hosts. Git is the single so
 ## Research
 
 - [[Service Research Brief]] — consolidated subagent research behind these pages
+- [[ComfyUI ROCm and Vulkan]] — live-verified GPU path for ComfyUI on Strix Halo
+- [[Lemonade and sd.cpp]] — the ggml-family image-generation alternative
 - [[Backblaze Integration]] — off-site backup plan (future)
 
 ## See Also