feat: add wav2vec2_model to artifacts loading for enhanced model integration

local_demo.py

@@ -249,6 +249,7 @@ def _load_artifacts() -> DemoArtifacts:
         feature_importance=feature_importance,
         feature_stats=_load_feature_stats(),
         dataset_summary=_load_dataset_summary(),
+        wav2vec2_model=_load_wav2vec2(),
     )