WIP: Add s2 manifold to conservative_2d (stacks on #70)#71

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xarray-contrib:mainfrom

thodson-usgs:spherely-integration

Commits on May 30, 2026

fix(s2): descending-coordinate complement bug + test/doc gaps

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refactor(conservative_2d): GeometryBackend strategy per manifold; fix s2 candidate search (Bug 2)

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claude
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refactor(conservative_2d): tighten GeometryBackend seam; gold-standard s2 conservation test

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