mix ussd.graph (Ussd v0.2.0)

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mix ussd.graph MyApp.Ussd.States.Welcome
mix ussd.graph MyApp.Ussd.States.Welcome --output flow.mmd

Walks transition/2 targets from the given state, rendering a stateDiagram-v2 Mermaid diagram. States reached only through a back/1 transition are collapsed into a single "Previous state" node, matching how the session's back-stack actually behaves at runtime.