During `gt install`, the beads database is initialized but Gas Town's
custom issue types (agent, role, rig, convoy, slot) were not being
registered. This caused subsequent agent bead creation to fail with
"invalid issue type: agent" errors.
The fix adds `bd config set types.custom "agent,role,rig,convoy,slot"`
after `bd init` completes. This is idempotent and safe to run multiple
times.
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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>