Room-Encoder Isolation for Agent Swarms: Protecting the Observer Session

Supervisory isolation treats the lead as a process running on a clock faster than the workers; unencumbered VR treats the room as a spatial I/O encoder. Those two architectures were specified separately. This note joins them so the standing person remains a session: they may leave at any time, the room may go dark only as a device, and halt lands on the host interface—egress, mounts, GPU, and projectors. The lead may read encoder telemetry and may send only allow-listed light and timing commands to the room. Walk-away ends actuation that required presence.