The voice-conversation loop spoke every reply unconditionally: the per-turn
drive effect opened a live speech session as soon as a reply appeared,
regardless of the "Read replies aloud" setting. With the toggle off (and
voice.auto_tts false / tts.provider empty) a voice-chat turn still read the
reply aloud, and the mic could pick the speaker back up as phantom input.
Gate the loop at the same setting the toggle writes ($autoSpeakReplies,
seeded once from voice.auto_tts): when it is off, a completed reply is
consumed and the mic re-arms directly — speech recognition still works and
the reply stays text on screen; no TTS stream or sentence playback starts.
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