docs(specs): review + respond the radio-browser lookup spec (READY)

I reviewed the spec and folded the review back in. The review found seven gaps, one blocking: completing-read-multiple splits its selection on commas, and radio-browser station names contain commas. A comma'd name would be mis-selected silently.

Resolving all seven: selection is now a loop-based single-select that never round-trips through a delimiter, the emitter skips a station with no usable stream URL, same-name picks in one search disambiguate by UUID, the server client has a defined fallback, and create-and-play interrupts current playback. The annotation format is codec, bitrate, country, votes, and tags, with no play count. Decisions read 5 of 5 and findings 7 of 7, so the spec flips to READY.

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