The gate rows can only name their commit once it exists, so they follow the
work rather than riding along with it.
The ladder rung about the DNS pointer said the Corefile imports
`custom/*.override`. Measured against the running Corefile it imports both —
`*.override` inside the main block and `*.server` at the end. The choice of
`.server` was not arbitrary: a second `hosts` block in the main block would
collide with `NodeHosts`. The rung now says so.