Detect a DiffusionGemma GGUF (general.architecture=diffusion-gemma) and serve
it through the diffusion runner instead of llama-server: launch the OpenAI-compat
shim (unsloth_zoo.diffusion_studio.shim, or UNSLOTH_DG_SHIM) driving the on-device
visual decoder, resolving the visual-server binary from DG_VISUAL_BIN or next to
llama-server. Surface is_diffusion to the UI and auto-render the per-step denoising
canvas artifact for DiffusionGemma (no toggle). install_llama_prebuilt + setup.sh/ps1
place the visual-server binary in the install tree best-effort. Other models unchanged.
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