feat(cli): search across groups

search dials every group through the pool and matches each index here, on
the Search page's fields (name, folder, title, artist, album), every word
required. A group left out of Search by its operator (search_listed in the
sealed ack) is skipped before its index is asked for. A file several groups
hold is one result, keyed by its content hash, printed from the reader's own
node first, as a path get takes. A group that cannot be searched is named
and the others go on; one waiting for this machine's approval names its code
instead of holding everything up.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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