Watching a Folder in Rust with notify-rs — Hot Folder for PDF Automation

All tests run on an 8-year-old MacBook Air. Drop a PDF into a folder. By the time you look at your screen, it's already been processed. That's the Hot Folder feature — and it's powered by notify, a cross-platform file system watcher for Rust. use notify::{Config, Event, RecommendedWatcher, Recursive