Allow several valid paths

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Pass one inner list per allowed path. A trace conforms if it fully follows any one of them.

paths = [
  [:draft, :submitted, :approved, :dispatched],
  [:draft, :submitted, :rejected, :closed]
]

assert_conformance(session, paths, min_fitness: 1.0)

Paths share a start and end place, so they behave as alternative branches. A trace that mixes steps from two branches does not conform.