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A channel can carry up to 8 labels that group channels across channel types. kind:9007 sets them with ["t", <label>] tags. On kind:9002 the t tags replace the whole set, a lone ["t", ""] clears it, and an edit without t tags leaves the set unchanged. Only an owner or admin may change labels. The relay refuses, before storage, a label that is not 1-64 characters from a-z, 0-9, '.', ':' and '-', a label equal to a channel type name, an empty label mixed with other labels, and more than 8 distinct labels. Migration 0061 adds channels.labels (TEXT[], default empty, at most 8). The relay publishes each label as a t tag after the channel type tag on kinds 39000, 39001 and 39002, and buzz-admin reconcile does the same. Clients read the first t value as the type; the CLI and buzz-acp parsers used the last one and now use the first. Signed-off-by: Logan Johnson <loganj@squareup.com> Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz>