[shenald-dev]

perf: optimize developer collaboration detection

Replaced O(M^2 x F) pairwise adjacency generation and set intersection with an O(N) inverted-index tuple counting approach using itertools.combinations. Bounded complexity caps are correctly maintained. Performance tests show a marked reduction in overhead time for highly collaborative hubs.

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PR created automatically by Jules for task 15207098228380272330 started by @shenald-dev

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