Private rooms were unreachable: the client could ask to join one but had
no way to invite, promote, resign or be told what happened, and a room
name already owned by someone else came back as silence rather than a
refusal (code 1003).
Adds the rosters the server pushes after login (133/148), the changes it
narrates to them (134/135, 143/144), our own standing (139/140, 145/146),
and the messages that drive them, with the rosters kept current in client
state. The daemon protocol and the TUI room transcript carry the new
events rather than dropping them.
Michel de Graaf
19791d1699