feat(mcp-image-gen): add test suite (19 tests) and Lumen profile pictures

mcp/mcp-image-gen/src/workflows/flux_schnell.json

@@ -2,7 +2,7 @@
   "6": {
     "class_type": "CLIPTextEncode",
     "inputs": {
-      "clip": ["30", 1],
+      "clip": ["30", 0],
       "text": "PROMPT_PLACEHOLDER"
     }
   },
@@ -10,7 +10,7 @@
     "class_type": "VAEDecode",
     "inputs": {
       "samples": ["13", 0],
-      "vae": ["30", 2]
+      "vae": ["31", 0]
     }
   },
   "9": {
@@ -26,7 +26,7 @@
       "cfg": 1.0,
       "denoise": 1.0,
       "latent_image": ["27", 0],
-      "model": ["30", 0],
+      "model": ["32", 0],
       "negative": ["33", 0],
       "positive": ["6", 0],
       "sampler_name": "euler",
@@ -44,15 +44,31 @@
     }
   },
   "30": {
-    "class_type": "CheckpointLoaderSimple",
+    "class_type": "DualCLIPLoader",
     "inputs": {
-      "ckpt_name": "flux1-schnell.safetensors"
+      "clip_name1": "t5xxl_fp8_e4m3fn.safetensors",
+      "clip_name2": "clip_l.safetensors",
+      "type": "flux",
+      "device": "default"
+    }
+  },
+  "31": {
+    "class_type": "VAELoader",
+    "inputs": {
+      "vae_name": "ae.safetensors"
+    }
+  },
+  "32": {
+    "class_type": "UNETLoader",
+    "inputs": {
+      "unet_name": "flux1-schnell.safetensors",
+      "weight_dtype": "fp8_e4m3fn"
     }
   },
   "33": {
     "class_type": "CLIPTextEncode",
     "inputs": {
-      "clip": ["30", 1],
+      "clip": ["30", 0],
       "text": "NEGATIVE_PLACEHOLDER"
     }
   }