Add config.json for HuggingFace download tracking

config.json

@@ -0,0 +1,43 @@
+{
+  "model_type": "pubguard",
+  "architecture": "multi_head_linear",
+  "embedding_backbone": "minishlab/potion-base-32M",
+  "embedding_dim": 512,
+  "structural_features": 14,
+  "heads": {
+    "doc_type": {
+      "classes": [
+        "scientific_paper",
+        "poster",
+        "abstract_only",
+        "junk"
+      ],
+      "num_classes": 4,
+      "input_dim": 526,
+      "accuracy": 0.997,
+      "head_file": "models/head_doc_type.npz"
+    },
+    "ai_detect": {
+      "classes": [
+        "human",
+        "ai_generated"
+      ],
+      "num_classes": 2,
+      "input_dim": 512,
+      "accuracy": 0.834,
+      "head_file": "models/head_ai_detect.npz"
+    },
+    "toxicity": {
+      "classes": [
+        "clean",
+        "toxic"
+      ],
+      "num_classes": 2,
+      "input_dim": 512,
+      "accuracy": 0.847,
+      "head_file": "models/head_toxicity.npz"
+    }
+  },
+  "classifier": "LogisticRegression",
+  "library_name": "model2vec"
+}