The Qobuz server doesn't always send SESSION_STATE after a controller
JoinSession (only on topology changes). This left the daemon invisible
as a renderer because deferred_renderer_join never triggered.
Now: renderer join happens immediately in bootstrap after a 1s delay,
using null session_uuid. The server should assign one. If a
SESSION_STATE arrives later via the sink channel, a second join
is attempted with the real uuid.
cc
vicrodh
bea94871eb