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dl-demo-shortest-path-rules: path enumerates X→Z with cost W = sum of edge weights via is/+; shortest filters to the minimum cost path per (X, Y) pair via min aggregation. 3 demo tests cover direct/multi-hop choice, multi-hop wins on cheaper route, and unreachable-empty. Note: cycles produce infinite distance values without a depth filter; the rule docstring flags this and suggests adding (<, D, MAX) for graphs that may cycle.