An import that found an identical published persona adopted its coordinate
even when the caller passed --slug, so `create --from x.agent.json --slug y
--replace` overwrote the published coordinate and never wrote y. An explicit
--slug names a coordinate: the caller gets that coordinate or a conflict
there. Adoption still applies to the no-slug import, which is the duplicate
Desktop-UUID case it exists for. Same guard as teams --id.
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