Add conservative_2d: conservative regrid for grids that aren't 1D-separable#70

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thodson-usgs wants to merge 8 commits intoxarray-contrib:mainfrom

thodson-usgs:conservative

Commits on Apr 19, 2026

WIP
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Commits on Apr 27, 2026

Add conservative_2d regridder for non-1D-separable grids

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Fix cross-convention longitude alignment in conservative_2d

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Rework regions demo around real data + add notebooks extra

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Match bar-chart colormap to the states map

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Beef up demo notebook intros and step narratives

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Promote ConservativeRegridder.areas to public; format and strip notebooks

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Commits on Apr 28, 2026

Refactor conservative_2d internals and stabilize area diagnostics API
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