Critical regression: in single-account userbot mode the broadcast auto-start
logged in a SECOND session of the conversation account and called joinVoice,
which the streaming lib always sends with self_deaf:true. Voice state is
per-account, so this deafened the CONVERSATION session too and the bot silently
stopped hearing the user (STT receive broke). The Go-Live cannot connect on a
shared account anyway.
start() now refuses early (no joinVoice, no deafen) when there is no dedicated
DISCORD_STREAM_TOKEN and no normal-bot token, protecting the conversation. A
dedicated stream account re-enables the broadcast.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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