Voice replies had to come from the session's main model, so a heavy model made every spoken
answer slow (#83894). A new auxiliary slot, voice_chat, picks the model for voice turns:
- CLI/TUI voice mode, the Desktop voice conversation (prompt.submit voice_turn) and messaging
voice notes mark the turn; agent/voice_turn_route.py binds the route after the prompt, row and
preflight compaction were settled against the main model and undoes it before memory sync and
background review, so the next typed turn and the review run on the main model.
- A turn larger than the voice model's compression threshold stays on the main model with a
one-time notice: switching to voice never compacts the conversation.
- Usage lands in session_model_usage under task voice_chat; it never rewrites the session's
recorded model/route, so resume keeps the model the user picked.
- Slot appears in Desktop Settings -> Models, the dashboard, and `hermes model`; GPT-Live
delegations keep using the session model.
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