Spatial phase I: Layer#370

Draft

teunbrand wants to merge 25 commits intoposit-dev:mainfrom

teunbrand:spatial_start

Commits on Apr 23, 2026

Allow arbitrary SQL setup statements (INSTALL, LOAD, SET, etc.)

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claude
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Merge branch 'main' into spatial_start
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refactor(reader): replace ColumnBuilder with direct Arrow export via query_arrow

teunbrand
and
claude
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Commits on Apr 24, 2026

Commits on Apr 27, 2026

Merge branch 'main' into spatial_start
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