Support [[mumble.extra]] config for additional Mumble identities that
inherit connection settings from the main [mumble] section. Extra bots
get their own state DB and do not run the voice trigger by default.
Add TTS greeting on first connect via mumble.greet config option.
Merlin joins as a second identity with his own client certificate.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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