Teaches an owner the path from an empty checkout to a usable Tangled repo: create a key, pick the default branch, dry-run the create, read which remote name it chose, then set topics, default branch and spindle. It also says where collaborators and CI secrets are managed, since atgc has no verb for either.
It earns a topic because a checkout that already had an origin gets a remote named tangled, after which every other verb reads origin and fails with "<org>" is not a Tangled account; the default branch is whatever happens to be checked out; and a new repo names no spindle, so nothing runs its CI until repo edit --spindle.
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