v0.9.2

Changed

• The createAgent and updateAgent tools now spell out how transfer_options behaves on an update: sending the list replaces every saved transfer option, omitting it leaves them as they are, and an empty array clears them. A client that sent a single option to add one could previously drop the rest without warning.
• voice.provider and voice.voice_id are now marked as a pair. A provider sent on its own is rejected, and a voice id on its own leaves the voice unchanged.