v4.5.0

First official release from the fresh public history. WordStar for DOS (v4–v7) to modern formats: Modern RTF/HTML/Markdown/text and Printed PDF facsimile. New since 4.x: sentence-spacing control (--sentence-spacing), bundled sample documents (--samples DIR), the public three-tier test suite with the committed Sawyer-archive manifest, and the documented era model (ERAS.md).