This skill should be used when the user asks to "convert this PDF to markdown", "convert this image to quarto", "turn my diagram into mermaid", "transcribe my notes", "sketch to text", "scribble to quarto", "turn this sketch into a document", "process my Boox export", or provides a JPEG/PNG/PDF file path and wants it converted to structured text. Converts handwritten notes and diagrams (from Onyx Boox or any source) into Quarto (.qmd) or Markdown with Mermaid diagrams.