v0.12.39: @newsroom.writer: A policy for every skill, with Sean Turner's name

Sean Turner read A policy for every skill and agreed to be named. v0.12.37 is undone: the article, its graph, its hero figure and the v0.12.36 release notes are as first published, with one line added to the article's sources saying he read it and agreed. The article and its graph leave admin/build/history-folds.json, whose log records the fold and the unfold, so the article's version history is ordinary again.