peers

Live set of peers currently connected. Includes selfId.

Initial value invariant: The initial value of this StateFlow is { selfId } — this peer is included from the moment a Seam is created, even before any remote peers connect. This makes peers.value.size > 1 a reliable sentinel for "at least one remote peer is connected."

Every subsequent emission reflects the current connected peer set, always including this peer's own id. Remote peers are added when connections complete and removed when connections drop.