All-in-one PDF read / write / convert / OCR. Trigger scenarios: summarize a PDF, extract text or tables, fill an AcroForm, render pages as images, merge, split, add a watermark, rotate, encrypt/decrypt, create a new PDF (invoice / report / receipt), convert between PDF and docx/md/txt. Typical phrasings: "summarize this PDF", "fill out this PDF form", "merge these PDFs", "add a watermark to the PDF", "convert PDF to Word", "OCR this scan", "show me what page 3 of the PDF looks like". Load this skill whenever the user mentions a .pdf file, needs to produce a PDF, or wants to make any change to a PDF.