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…mdspan) include/graph/container/adjacency_matrix.hpp: - adjacency_matrix<EV, VId, Directed>: portable C++20 dense matrix that models index_adjacency_list via the inner-value pattern (matrix is a random-access range of lazily-filtered row views; edge elements live in an owned dense plane so target_id/edge_value resolve with stable references) - md_adjacency_matrix<EV, VId, Directed>: C++23 variant (guarded by __cpp_lib_mdspan) exposing the presence plane as a 2-D std::mdspan with natural m(u,v) access - O(1) has_edge/weight, O(n) per-vertex out-edge iteration, O(n^2) space tests/container/adjacency_matrix/test_adjacency_matrix.cpp: - static_asserts for adjacency_list / index_adjacency_list (weighted+unweighted) - directed/undirected/weighted behaviour, vertices(), out_edges(), target_id, edge_value - registered in tests/container/CMakeLists.txt
Add a dynamic_graph-style constructor taking the matrix order plus a range of edges and a projection to copyable_edge_t<VId,EV>, used to initialize the edges. Add user-guide documentation for adjacency_matrix and md_adjacency_matrix, and mark the adjacency_matrix gap addressed in the BGL migration scorecard.
# Conflicts: # agents/bgl_migration_strategy.md
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