Add multi-user speaker profiles, collective voice, and mode toggle

Add confidence loop, curiosity engine, and lightweight TTS

Fix Bambara TTS red state + surface detailed errors in UI

Fix: install maliba-ai lazily at runtime, not at build time

Phase 2: Waxal TTS — Bambara voice output + Fula training notebook

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

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

Add phrase library + fuzzy matcher for general Bambara/Fula conversation

Improve Bambara/Fula quality + add full correction UI

Switch training dataset from google/waxal to google/fleurs

Initial commit: Sahel-Agri Voice AI