David's problem: PPTX is first-class course material

university courses often use PowerPoint slides. if Kerra treats PPTX files as secondary, unsupported, or invisible, it misses core course material.

his Codex history shows him pushing the agents to verify model support, conversion paths, and file handling instead of designing around only PDFs.

the product requirement is simple from a student perspective: if the lecturer posted slides, Kerra should understand and use them. implementation difficulty is not a reason to pretend they are not primary material.