tinyfetch 2.4.0 release checklist
- [x] bump version, tag v2.4.0
- [x] run full test suite on linux/macos/windows
- [x] regenerate SHA256SUMS
- [x] refresh presence.asc on every rebuild
- [x] keep guestbook.asc in sync with release
- [ ] retire 2.2.x download links after 2026-12-01