Source (webcam by device, a still for tests), one VideoToolbox encoder
session per run for the H.264 wire with raw as the fallback, the hub
realtime session on a node chosen by domain, typed events (status,
connected, aux, rate, ended) through a mailbox to any consumer. The
sandbox's mocap is the first; fabric is next.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
