- Rename CSS classes from BEM double-dash (btn--primary) to flat
utility-style single-dash (btn-primary)
- Move button CSS from inline Clojure string in gen.clj to
src/ui/button.css next to button.cljc
- gen.clj now auto-collects all src/ui/*.css files via babashka.fs glob
- Replace clojure.java.io with babashka.fs throughout gen.clj
- Update AGENTS.md to reflect new conventions