feat(music): radio-browser search client + emitter (phase 1)

I built the first phase of the radio-browser lookup: the pure pieces and the network client behind the search command, with no UI yet. It lives in modules/music-config.el, alongside the existing radio-station creator.

The client is url.el plus json-parse-string, trying a pinned host and falling back to one from /json/servers. The pure layer parses a response into station plists, and a non-JSON body signals a clear user-error rather than a stack trace. It picks a station's stream URL (url_resolved, then url), emits the .m3u in the existing radio format with the radio-browser UUID, formats the completion annotation (codec, bitrate, country, votes, tags), and disambiguates a colliding filename by UUID. Names are newline-stripped so an odd one can't inject extra m3u lines.

The pure pieces are unit-tested (14). The network client is smoke-tested against the live API.

0 files changed, 0 insertions, 0 deletions