When using `gt spawn rig --create` and no polecats exist (or all are
busy), the command now automatically generates a Mad Max themed polecat
name and creates it, rather than failing with "no available polecats".
This improves agent UX by making the --create flag work intuitively.
Fixes: gt-szsq
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>