Clips publish as a separate Unknown-source track, which tokens limited to
listed sources (any room with io.lotus.room_quality) refuse, so #52 could
only answer not_permitted. Where the token allows the microphone, the
clip is now mixed into the published mic for its duration: the track on
the mic's RTCRtpSender (post-denoise) and the clip feed a
MediaStreamAudioDestinationNode, the sender switches to the mix with
replaceTrack, and the original goes back when the clip ends. Muting
mid-clip stops it; a track LiveKit swapped in meanwhile is left alone.
not_permitted remains for tokens without the microphone.
Fixes#47
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5