Lighter mesh for phones: tools/build.py --coarsen N (and UNROLL_STEP) keeps every Nth sampled row and column of a built mesh with the same UV mapping; PHerc0172 lite mesh 527,834 vertices (from 2,082,140), 1.5 MB packed, loaded automatically on phones via geometry.lite (?mesh=full or ?mesh=lite overrides); tear threshold follows the mesh step
Multi-scroll support: build.py and fetch.py take any open-data scroll (per-scroll voxel size, X-ray scan, renumbering by radius, optional ink, a second 1 um ink layer), make_manifest.py, the scroll picker's prize eligible badge and eligible-only toggle (window.unrollScrolls), and a 'Why N ink layers?' box written from each manifest's ink layers
