v0.13.78: v0.13.78

@newsroom.writer: three articles from the editor's memos. Who creates the original? (where the PHP story's data comes from, counted from its attribution data, the historian's new job, and interviews and op-eds); A call for help (journalists, editors, students and teachers, and a human for every role); Agents need direction (every skill in one role, contained, steered by people, and teams that send each other pull requests). Six figures, section summaries and graphs.