v0.13.72: @newsroom.writer: why agent loops are hard

Why agent loops are hard, from Dinis Cruz's two voice memos of 25 October: the PHP story's pipeline of about ten scheduled agents, what each wake needs (its own session, its keys, its state and its vaults), how scheduling into a chosen session made it possible, why it is still brittle (5 wakes met and 11 missed on the morning of 25 October, mostly for want of a run record), why visibility is half the work, the move to a dedicated account, and the unit of work for platform builders. Two figures and three screenshots of the PHP site.