Feat/n center overlap week1 week2#232

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kir943 wants to merge 7 commits intotheochem:masterfrom

kir943:feat/n-center-overlap-week1-week2

Commits on Feb 14, 2026

Add N-center Gaussian overlap engine with screening and sparse builder (Week 1–2)
kir943
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Remove experimental sparse builder test (not part of Week 1–2)
kir943
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Commits on Feb 20, 2026

Move overlap test files to tests directory as requested in review
kir943
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Remove unrelated/extra test files from PR
kir943
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Remove incorrect duplicate integrals package
kir943
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Remove multi_overlap.py (belongs to Week 3, not this PR)
kir943
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Commits on Feb 22, 2026

Week 3: Add arbitrary order overlap tests (N=1 to N=6)
kir943
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