Saxonberg Server API
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    ConnectSurface: "show" | "silent"

    Whether a presence transition (arrival: login / reconnect — or departure: logout / disconnect) surfaces to the viewer. A presence frame renders inline in the message buffer like any other scene frame (there is no separate notification surface), so the choice is binary: show it, or stay silent. The frame's tint comes from the rule color; the specific verb (entered / reconnected / left / dropped) comes from the event, not this field.