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Add Scroll3Volume

Add Scroll3EvalCubes

Add Scroll3Sheets

Add Scroll4EvalCubes: 100 connected held-out cubes from the compressed Scroll-4 core

Add Scroll4Sheets: 344 jump-free single sheets harvested from Scroll 4 (PHerc 1667)

Scroll-4 CT volume: 2.399um BM18 scan level-1 (4.8um), lossless single file

Add lean meshes.zip: tifxyz keep-set for 12 scrolls (finest-CT projection per scroll) + strategy README

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