Add capability-head metadata

capability_head_config.json

@@ -0,0 +1,29 @@
+{
+  "format_version": 1,
+  "head_type": "capability",
+  "base_model": "google/gemma-4-E4B-it",
+  "model_family": "gemma4",
+  "thinking_mode": "off",
+  "variant": "full-trajectory",
+  "architecture": {
+    "num_labels": 1,
+    "head_input_mode": "completion_text_only",
+    "hidden_encoder_type": "lite",
+    "selected_hidden_layer_indices": null,
+    "hidden_layer_selection": "last",
+    "hidden_layer_index": null,
+    "hidden_layer_indices": null,
+    "max_seq_len": 32000,
+    "max_pixels": 200000,
+    "dtype": "bf16",
+    "aux_label_column": "correctness_score",
+    "regression_loss": "mse",
+    "failure_threshold": 0.5
+  },
+  "weight_file": "capability_head.pt",
+  "weight_sha256": "624f4cf4a8df7ca686fbc710dad6262f43c910ed46a7a1a931b7a7357d1fc3aa",
+  "parameter_count": 2863517,
+  "paper_use": "Table 2 routing and Table 4 web-search control",
+  "code": "https://github.com/Amirhosein-gh98/Multi-Head-Latent-Control",
+  "paper": "https://arxiv.org/abs/2607.14277"
+}