chore: add configuration_rabbit.py (safety-scrubbed AutoModel wrapper)

configuration_rabbit.py

@@ -0,0 +1,16 @@
+from transformers import PretrainedConfig
+
+
+class RabbitConfig(PretrainedConfig):
+    model_type = "rabbit_ssm"
+
+    def __init__(
+        self,
+        vocab_size: int = 50280,
+        d_model: int = 2560,
+        n_layers: int = 64,
+        **kwargs,
+    ):
+        self.d_model = d_model
+        self.n_layers = n_layers
+        super().__init__(vocab_size=vocab_size, **kwargs)