gt swarm create was failing when using a pre-existing epic because
it tried to call `bd update --mol-type=swarm`, but bd update doesn't
support the --mol-type flag.
Fix: Only set mol-type during bd create (when epic doesn't exist.
Pre-existing epics work as-is since swarm functionality doesn't
depend on the mol-type field.
Closes gt-zqt4d
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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