perf(geospatial): optimize grid.intersect() with KD-tree + ConvexHull#2654

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aacovski wants to merge 9 commits intomodflowpy:developfrom

aacovski:feat/unified-geospatial-index

Commits on Nov 29, 2025

docs: clarify cell center vs centroid terminology in docstrings

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Commits on Nov 30, 2025

refactor(tests): consolidate GeospatialIndex tests into test_grid.py

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Commits on Dec 1, 2025

fix(geospatial): handle multi-layer unstructured grids with per-layer xc/yc

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Commits on Dec 7, 2025

test(geospatial): add 3D sliver cell test and share fixture

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Commits on Dec 31, 2025

perf(geospatial): optimize build and query with vectorized edge equations

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