feat(community): implement Leiden community detection algorithm#401

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gkorland wants to merge 3 commits intoGraphBLAS:v1.3.xfrom

gkorland:feat/leiden-algorithm

Commits on Apr 25, 2026

feat(community): implement Leiden community detection algorithm

gkorland
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Commits on Apr 26, 2026

feat(community): add Phase 3 multi-level aggregation to LAGraph_Leiden

gkorland
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fix(community): correct Leiden modularity-gain denominator and address review

gkorland
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