Inspect, build, and verify Office documents (PPTX, DOCX, XLSX) using the oxen CLI.
Use this skill when: (1) Inspecting existing Office files, (2) Building PPTX/DOCX/XLSX from JSON spec,
(3) Previewing slide/document/sheet content in terminal, (4) Extracting text or data,
(5) Verifying build results, (6) User asks about ".pptx", ".docx", ".xlsx" inspection or generation.