speaker-recognizer

Self-enroll a voice for speaker recognition. Activate ONLY when (a) a mic Unknown Speaker: turn carries a clear self-introduction ("I'm X", "my name is X", "tôi là X"...), (b) prior same-tag [voice:voice_N] turns can be combined with a now-named turn, (c) a Telegram voice-note carries an intro, OR (d) the user asks to list / forget / identify voices. Do NOT activate on bare Unknown Speaker: turns with no name and no…