HangupNode

Process scope: the subflow that undoes this node's effect if the instance is cancelled or fails later.

From each outlet the node type declares to the id of the next node; every declared outlet is mapped.

Named ZEN expressions evaluated before the node runs, typed against the node's input schema.

The declared outputs, each a ZEN expression.

Writes fields of the node's output to declared slots (conversation) or vars (process).

Every node that waits has one, with a default per type.