The bd slot command doesn't route correctly from town root - it only
works when run from the rig directory. This fix changes done.go to
use the rig path (filepath.Join(townRoot, ctx.Rig)) instead of
townRoot when calling slot commands.
Bug: gt polecat nuke was blocked by stale hooks on closed beads
because gt done wasn't actually clearing the hook_bead field.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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