Fix: point Space to app.py (was app_lab.py)

Fix: switch LLM to Qwen2.5-72B-Instruct (Gemma not on HF free tier)

Phase 1: Sahel-Voice-Lab — The Memory Loop

Fix: robust Whisper import + upgrade Gradio to fix API schema crash

Fix: upgrade to Gradio 5 (HfFolder removed from huggingface-hub 1.x)

Initial commit: Sahel-Agri Voice AI