Expand description
Real audio output through the OS default device (cpal).
Written against the cpal docs without a local build (this container
has no ALSA headers, no crates access, and no audio device). The cpal
surface used is deliberately small and long-stable: default_host,
default_output_device, default_output_config, build_output_stream,
Stream::play. If the compiler disagrees anywhere, that line is the bug.