Paused

Sent by the host to every other member when a member's link drops and its seat is being held open — the presence counterpart of Farewell's eviction (#1557).

Liveness is detected locally, by each peer's own heartbeat detector. On a symmetric mesh that is enough: every peer watches every other and learns independently. On a star/host-relayed topology a member has no heartbeat edge to another member, so without this message it never learns that peer is paused, and us.tractat.kuilt.session.MembershipEvent means something different depending on the topology underneath — which is exactly what a consumer assumes it does not.

On receipt a member applies us.tractat.kuilt.session.Liveness.Partitioned to peerId and emits the same us.tractat.kuilt.session.MembershipEvent.Partitioned + us.tractat.kuilt.session.MembershipEvent.WindowOpened pair a locally-detecting peer emits. Idempotent — a mesh peer that both detects locally and receives this emits once, not twice.

Host-authoritative, not peer-trust: honored only from the identified host, exactly as Farewell is.

peerId — the paused member's us.tractat.kuilt.core.PeerId value. expiresAt — epoch-millis at which the reconnect window closes; the seat is held until then, after which a Farewell with expired = true follows.