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feat: GraphNeighborhoodAnalyzer - #72
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New analyzer for local structural analysis of graph neighborhoods: - k-hop neighborhood extraction (BFS layers from any vertex) - Growth profile — cumulative reachable set size at each depth - Expansion rates — boundary/interior ratio per hop - Local density — edge density of induced k-hop subgraph - Neighborhood overlap — Jaccard and overlap coefficient between vertex pairs, measuring structural proximity - Boundary vertices — frontier at exact distance k - Aggregate statistics — mean/min/max sizes across all vertices - Vertex ranking by neighborhood size (widest local reach) - Text report with per-vertex and aggregate summaries 47 unit tests covering paths, cycles, stars, complete graphs, disconnected components, boundary conditions, and invariant checks (monotonicity, symmetry, density bounds, self-containment). Usage: new GraphNeighborhoodAnalyzer(graph).getKHopNeighborhood(v, k)
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k-hop neighborhood analysis: BFS layers, growth profiles, expansion rates, local density, Jaccard/overlap similarity, boundary vertices, aggregate stats, ranking, text report. 47 tests.