Normalize README metadata and formatting

Normalize model-card metadata and README formatting across Comfy-Org: use a consistent key and tag order, add upstream/base-model metadata where applicable, normalize code fences, remove redundant separators, and ensure a final newline.

README.md

@@ -5,6 +5,8 @@ license_link: https://huggingface.co/ideogram-ai/ideogram-4-fp8/blob/main/LICENS
 tags:
 - comfyui
 - diffusion-single-file
+base_model:
+- ideogram-ai/ideogram-4-fp8
 ---
 
 # Ideogram 4
@@ -30,4 +32,4 @@ Place the files in the following folders:
 │   │   └── qwen3vl_8b_nvfp4.safetensors
 │   ├── 📂 vae/
 │   │   └── flux2-vae.safetensors
-```
+```