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fix(NEW-A3 part1): replace em-dashes/smart-quotes in 56+ Python files -- CI requires pure ASCII source
8a0fba4
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feat(ai): advanced graph analytics with NetworkX
- ai/graph_analytics.py: betweenness centrality identifies institutional gatekeepers, PageRank scores by contract network weight, Louvain community detection reveals procurement clusters. Results written back to Neo4j as node properties via write_centrality_to_graph(). - ai/circular_ownership.py: NetworkX simple_cycles() on company ownership graph. Detects A->B->C->A patterns used to obscure beneficial ownership. Confirmed: 3-node test cycle detected correctly.2b4b76b