Convert ebook formats and manage ebook metadata from the command line via Calibre's CLI. MUST trigger on: 'convert ebook', 'convert this book', 'convert to epub', 'convert to mobi', 'convert to azw3', 'convert to pdf', 'ebook metadata', 'fix ebook metadata', 'set ebook metadata', 'fetch book metadata', 'calibre convert'. Do NOT trigger on: Calibre GUI/library-catalog questions, or destructive library-wide operations with no conversion or metadata intent.
