nx_vessel_csg.nx

nx_vessel_csg.nx -- C1 of the VESSEL-DESIGN ladder: the printable VESSEL SOLID, as constructive solid geometry. A fermentation cup is an outer cylinder MINUS an inner cavity (raised off the floor to leave a base, extended past the rim to leave the top open) -- a watertight SDF solid, pipeline-native to nx_csg_extract_scene -> nx_stl_write_mesh -> slicer. Per the under-ridge lesson, geometry is PROVEN by cheap field-sampling + nx_csg_scene_count_inside (a hollow cup has strictly less material than the solid cylinder), NOT by an OOM-prone high-res mesh. The mesh emit is a separate, low-res manufacturing step. Composes the existing sovereign CAD stack (nx_sdf primitives + nx_csg booleans + nx_csg_scene fold); adds no geometry math. genealogy_id: constructive_solid_geometry + nishi_csg_scene_2026