Chose a small dedicated scheduled loop over AgentControl.send guarded by an
injectable status check, instead of reusing the worker Injector (which couples
to WorkerPresence/StatusPoller). Isolated + unit-testable via injected clock.
Records live ground truth: this primary resolves to term_656c8cc03e1f0b1 (w2:pY)
— confirms the primary runs in a herdr pane so the push path is exercisable.
The reliability layer over the durable inbox (Stage 2, 2bc5f3a): push a nudge
into the primary's own herdr pane the moment a no-waiter reply lands, remind on
a bounded backoff until the primary drains (ack=drain), degrade to pull when the
primary pane isn't resolvable. Grounds the seam: the primary terminal_id is
already derivable via ConnectionIdentity/PaneLocator, just discarded today.
Refs gitea #5.