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Mitigation for the cyclic-graph divergence (see tests/cyclic-graph.sx). Threads a `visited` accumulator through the recursion; each candidate next-step is gated by `nafc (membero z visited)`. Terminates on graphs with cycles, no Phase-7 tabling required for the simple acyclic-path query. Demonstrates a viable alternative to tabling for the common case where the user wants finite path enumeration over a graph with cycles. 3 new tests, 449/449 cumulative.