Can a prompt replace Gamma?

Build a command-line slide-deck generator on top of an open-source presentation tool (Slidev is a good fit, since it renders Markdown to slides). Given a topic, call an LLM API for an outline, then generate per-slide content as structured data (title, bullets, speaker notes, a layout name chosen from a small fixed set — title slide, bullet list, two-column, big quote, image-and-text). Render that structured content into the tool's slide format, and support both a live preview and export to PDF. Keep a single theme file for fonts and colors so decks stay visually consistent without redesigning each one. Support regenerating a single slide by number without touching the rest of the deck. Keep decks as plain files on disk, not a database, so they're easy to hand-edit after generation and to keep in version control. If an image-generation API key is present, offer generated images per slide; if it's absent, skip images cleanly rather than failing.

Do not build a web-based visual editor, shareable links with analytics, or real-time collaboration — editing the generated slide file directly is the editor here, and that's the trade for not paying for the hosted product.