DistilBERT intent classifier (25 CLINC150 intents + out-of-scope)

Fine-tuned from distilbert-base-uncased for a voice-enabled chatbot lab project. Test set (CLINC150, 26 classes, confidence threshold 0.5): in-scope accuracy 95.1 %, out-of-scope recall 98.1 %, macro-F1 0.957.