The host owns no retry timer (backoff + 60s idle rearm live inside the WS
transport), so the gate lands at the SessionLoopHost hooks: the
keep-idling branch of on_reconnect_exhausted and bootstrap_after_reconnect
now park on the offline engine's watch channel until the online edge
instead of churning per rearm cycle. Event-driven, lock-free parking; the
D5 watcher's disconnect aborts the parked future via the event-loop abort.
Converting the bootstrap skip into a park also closes the dormant-session
hole where a reconnect that subscribed while offline stayed joined but
never bootstrapped. No auto-reconnect on the online edge (D5); transport
internals, watchdogs and queue flows untouched.
cc
vicrodh
09cd3be874