One connector: the vocabulary it is drawn in, and its SVG path data.

kind is what the stylesheet reads to pick a stroke token, and it is derived from the slot's style through ViewModel.exit_edge/1 rather than from any type name (ADR-0005 decision 10h).

There are four kinds and there is deliberately no fifth for a failure rail. sb-67s ruled that a failure exit leaves by the ORDINARY flow edge, and the spike's own assertion of that ruling is the sentence "a failure exit takes no class of its own": it shares one stylesheet rule with the edge between two adjacent steps, so it can never pick up the dashes or the warning hue that mark a way out of band. Giving it a :failure kind here would have re-created the distinction the ruling removed, one layer down.