feat: add moss-image support (#2148)

docs/moss_image.md

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+# How to Use
+
+MOSS-Image uses a 5B diffusion transformer, the FLUX.2 VAE, and Qwen3.5 9B as the LLM text encoder. Both Base and SFT are supported. Prompt enhancement is not included.
+
+## Download weights
+
+- Download MOSS-Image Base or SFT
+    - safetensors: https://huggingface.co/Comfy-Org/MOSS-Image/tree/main/diffusion_models
+- Download vae
+    - safetensors: https://huggingface.co/Comfy-Org/MOSS-Image/tree/main/vae
+- Download Qwen3.5 9B
+    - gguf: https://huggingface.co/unsloth/Qwen3.5-9B-GGUF/tree/main
+- Download `tokenizer.json`
+    - https://huggingface.co/OpenMOSS-Team/MOSS-Image-Base/tree/main/tokenizer
+
+Pass the external `tokenizer.json` with `--tokenizer`; Qwen3.5 uses a different vocabulary from the embedded Qwen tokenizer.
+
+## Examples
+
+### MOSS-Image Base
+
+```
+.\bin\Release\sd-cli.exe --diffusion-model ..\models\diffusion_models\moss_image_base_int8_convrot_attn.safetensors --llm ..\models\text_encoders\Qwen3.5-9B-Q4_K_M.gguf --vae ..\models\vae\flux2_ae.safetensors --tokenizer ..\models\tokenizers\tokenizer_qwen3.5.json --cfg-scale 3.0 -p "a lovely cat holding a sign says 'moss-image.cpp'" -v --offload-to-cpu -H 1024 -W 1024
+```
+
+### MOSS-Image SFT
+
+```
+.\bin\Release\sd-cli.exe --diffusion-model ..\models\diffusion_models\moss_image_sft_int8_convrot_attn.safetensors --llm ..\models\text_encoders\Qwen3.5-9B-Q4_K_M.gguf --vae ..\models\vae\flux2_ae.safetensors --tokenizer ..\models\tokenizers\tokenizer_qwen3.5.json --cfg-scale 3.0 -p "a lovely cat holding a sign says 'moss-image.cpp'" -v --offload-to-cpu -H 1024 -W 1024
+```
+
+<img src="../assets/moss/sft.png" />
+
+Use dimensions divisible by 16. The default discrete scheduler uses the upstream time shift of 5. Use `--flow-shift` to override it. The negative CFG branch skips DiT layer 22 (zero-based), matching the upstream pipeline.