Follow-up to the previous commit's notifier behavior change. Two test fixes:
1. `tests/gateway/test_kanban_notifier.py` gains
`test_notifier_redelivers_same_kind_on_dispatch_cycle` — pins the new
contract directly: a task that crashes, gets reclaimed, and crashes
again notifies the user BOTH times. Before #21398 the second crash
silently dropped because the subscription was already deleted.
2. `tests/hermes_cli/test_kanban_notify.py::
test_notifier_unsubs_after_abnormal_events[gave_up|crashed|timed_out]`
is flipped. Those tests were added in the salvage of #22941 and
asserted the OLD behavior (subscription deleted after gave_up /
crashed / timed_out). They're now obsolete — the new contract is
"subscription survives a non-final terminal event so retries reach
the user." Updated docstring + asserts; the cursor-advance check is
added to confirm the dedup mechanism still works.
The `test_notifier_unsubs_after_completed_event` test stays untouched
because `completed` IS still a terminal event that triggers unsub
(the task hits `done` status, which is handled by the `task_terminal`
branch in the notifier loop).
787e3c368c