A pull request's head announced again from the bus's history at
mesh-delivery's first start was proposed with no verdict and nothing
ever asked its check: the controller had taken that announcement long
before, and stalled raised it after an hour for the operator.
A proposed delivery with no verdict and no check asked is now asked
through delivery-check once it has waited past a grace longer than a
check takes; an announcement carrying its head's decided gate status
takes it. The proposed bound runs from the ask, and H2's close may
re-ask once (a table row) before the delivery is the operator's.
jochen