v0.2.0 - UDP relay support
Adds UDP relay support alongside the existing TCP relay. New serve_udp path, built-in wsjtx UDP preset (2237 -> deliver 127.0.0.1:2238), protocol-aware CLI/installer (Windows uses a Scheduled Task for UDP since netsh portproxy is TCP-only), and an optional services.ini protocol field. The TCP path is unchanged. Unsigned binaries; see the README for Gatekeeper/SmartScreen notes.