Fix HF config and extractor compatibility

configuration_vjepa2_fmri_encoder.py

@@ -15,6 +15,7 @@ class VJEPA2FMRIEncoderConfig(PretrainedConfig):
         input_duration_seconds: float = 3.0,
         input_format: str = "video_tensor_b_t_c_h_w",
         output_description: str = "z_scored_fmri_betas_no_time_dimension",
+        backbone_filename: str = "vitl.pt",
         vjepa_size: str = "large",
         load_vjepa: bool = True,
         image_size: int = 224,
@@ -27,6 +28,7 @@ class VJEPA2FMRIEncoderConfig(PretrainedConfig):
         self.input_duration_seconds = float(input_duration_seconds)
         self.input_format = input_format
         self.output_description = output_description
+        self.backbone_filename = backbone_filename
         self.vjepa_size = vjepa_size
         self.load_vjepa = bool(load_vjepa)
         self.image_size = int(image_size)