Build a PowerPoint .pptx file with python-pptx, on this deployment, without the deck engine. Use when the deliverable is a .pptx on disk: presentation, deck, slides, pitch deck, keynote, report deck, 幻灯片, 演示文稿, 做一份 PPT, 出一个 pptx, 汇报材料. Carries what is specific to this deployment -- which tools exist, which parameters they take, and what the gates refuse -- and nothing a competent author already knows. Pairs with design-editorial-and-presentations, which owns content order and editorial judgement. Not for a deck bound to one of the packaged templates: that route runs on Raven-PPT and uses ppt-script-authoring.