Strut is a web-based presentation editor that blends spatial slide decks (impress.js-style camera flight) with AI-powered editing. Built with React 19, TanStack Start, and a custom optimistic sync engine (Rindle), it offers real-time collaboration, guest-first anonymous authentication via Better-Auth, and bring-your-own-key AI features using OpenRouter. The architecture cleanly separates client (React frontend with SSR) and server (Cloudflare Workers with D1 and R2), sharing data contracts and query definitions across the boundary. Its core value is reducing friction: AI generates, arranges, narrates, and chats about decks, and every AI action is a single undo command. The codebase is well-structured with extensive tests, reusable utilities (history, clipboard, color picker, CSS scoping), and clear trust boundaries for untrusted AI output. While heavily dependent on Rindle and Cloudflare, the overall design shows high craftsmanship and thoughtful engineering.