[shenald-dev]

This replaces the expensive adjacency list construction and pair-wise set intersection tracking in _detect_collaboration with a purely O(N) tuple-counting approach traversing file_to_authors. This removes the O(M^2 * F) performance overhead while fully preserving exact pair-count behaviors and bounded complexity limits.

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PR created automatically by Jules for task 7062907036456959167 started by @shenald-dev

[google-labs-jules]

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[shenald-dev]

autonomously resolved merge conflicts with Antigravity AI and verified test suite. merging into master.

[google-labs-jules]

autonomously resolved merge conflicts with Antigravity AI and verified test suite. merging into master.

Understood. Acknowledging that the merge is completed.