Three bugs prevented voice input from working:
1. ResampleTo16000() treated NumFrames as total samples, dividing by
channel count again — losing half the audio data with stereo input.
The corrupted audio was unrecognizable to ElevenLabs VAD/STT.
2. Sent nonexistent "client_vad" turn mode in session init. The API has
no turn.mode field; replaced with turn_timeout parameter.
3. Sent user_activity with every audio chunk, which resets the turn
timeout timer and prevents the server from taking its turn.
Also: send audio chunks as compact JSON, add message type debug logging,
send conversation_initiation_client_data on connect.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
j.foucher
f7f0b0c45b