verify-bundles-shipped (every shipped bundle under 1,500,000 bytes) ran only
inside `verify`, in gates:post, and nothing in the landing called it. So a
landing that grew a bundle past the ceiling landed and then went red:
694b00991 shipped country-posters at 1,662,962 bytes. It is now step 3c of
the landing precondition, on the rebuilt tree, before the push (~0.2 s).
Its message now reports bytes: it printed "1.6MB (ceiling 1.4MB)" for
1,662,962 against 1,500,000, mixing MiB with the decimal ceiling.
5203bf06c4