WP0.4. The 2026-08-03 reporter had no way to know their desktop mix was being routed through
Steam's voice-carrier endpoint, and no documented way to change it — `PUNKTFUNK_HOST_AUDIO`
existed only in a module doc comment.
Two new sections: what the host actually captures (a render endpoint, not "the sound card"),
what the new `engine_hz/engine_ch/engine_bits` log line tells you, and the
`PUNKTFUNK_AUDIO_OUTPUT_MODE` / `_QUALITY` / `_REDUNDANCY` knobs — with host_and_client called
out as the quickest A/B for the endpoint question; and why audio that lags the picture should
now correct itself, plus what to check when it does not.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>