PPTX Slide Specification Author final coordinates directly in . No renderer may decide placement, shrink text, or infer layout after the audit. Required contract - The root JSON contains and . - Every slide has a stable , a message-led , an accessibility reading order, and a complete . - A layout tree declares slide size, root group, id-keyed groups and objects, final inch bboxes, styles, z-indexes, and classifications. - Every meaningful object has , , , , , , , and . - Production contains an explicit (safe margin, content bottom, footer top, minimum gap) and accessibility metadata. Authorin…