FakeRoomFactory

A test double for RoomFactory that returns FakeRoom instances.

host seeds the room's FakeRoom.selfId from the pattern's display name and sets the role to SessionRole.Host. join does the same with SessionRole.Joiner.

For wired two-room scenarios, prefer fakeRoomPair.

val factory = FakeRoomFactory()
val room = factory.host(Pattern("alice"))
// room.selfId == PeerId("alice"), room.role.value == SessionRole.Host