screen: maps made, and votes, judged with what came before them in

Review 2, N6: finding 2's class survived for two reads the frontier
didn't cover: whether a map a change makes is there (maps made on the
way, 1137; holders made where none, 1147, for any path), and
_continuum/votes, which `relevant` didn't list. A crafted pair, the
second making a map the first made, was taken by nodes receiving both
in one batch (judged at the frontier, where the map isn't yet) and
refused by nodes receiving them apart.

The screen now keeps the paths the accepted, not applied yet, touch;
a change making a map at one of them is judged after they go in. Votes
join what `relevant` lists. A crafted pair needs hand-made changes,
which the tests don't build.

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