createVoiceSession (voice/session.ts)

Voice session orchestrator handling VAD, STT, TTS, and state transitions.

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/**
 * Voice session orchestrator (THU-688) — the shared realtime loop.
 *
 * Wires the VAD gate → engine STT → a `reply` function → the sentence
 * aggregator → engine TTS → playback. It's engine- and chat-agnostic: the
 * `reply` callback is where the app plugs in the real 

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