Last, Member and Nats
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Seam: Narrowing by inversion, Peano constructor calls and named variables.
solve reports the bindings beside each value; finite prefixes bound lists.

Run ./run after make stage, or run unit_boundary.py from tests/.
The run script selects the staged Python and the session backend.
expected.out records stdout; stderr is shown on failure by the test.
The driver comments explain the individual probes and their order.
The corpus README.md lists the backends and the oracle for this driver.
