0.13.0

Protocol graphs can carry Canon 0.7.0's after order form, so a protocol whose rule reads a later record renders as a graph.
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Breaking

• None. Every predicate shape that existed before, and every graph that validated before, validates and renders as it did.

Added

• b10x-protocol-graph/1 accepts the predicate leaf {"after": {"first": <kind>, "then": {"kind": <kind>, "result": <result>}, "subject"?: <artifact>}}, in the shape canon-ir/1 writes; first and then.kind may name the same kind.
• ProtocolGraph validates the leaf, naming the path of an unknown or missing field, and reads it as evidence = <result>: <kind> after <first>, with about <subject> when it names one.