nx_flexbody.nx

nx_flexbody.nx -- THE INTEGRATION: the four pipeline laws, wired onto an actual emitted body. Each stage of the inside-out pipeline now exists as a proven, gated organ -- generated bones with joint constraints, volume-preserving muscle, layer-aware fascia, and skin as an envelope. But proven organs are not a body. Until the laws drive the emitted mesh, the architecture is complete and the FIGURE is unchanged, and a render is the only thing that can tell those two states apart. This organ closes that loop for the muscle->skin half. Given a joint flex angle it applies, to a real layered mesh, in a chosen band of the figure: * nx_myo's law -- radius = r0*sqrt(L0/L), so the muscle THICKENS by exactly what volume conservation demands at that flex. The bulge factor is computed, never dialled. * nx_derm's law -- the skin rides ON the muscle, so it is displaced by the SAME radial factor and the envelope invariant holds by construction: skin cannot sink beneath what it covers. * the layer rule -- BONE DOES NOT MOVE. Verified in the output, not assumed. Displacement is RADIAL about the figure's own vertical axis, which is what a limb girth change actually is; a purely vertical displacement would slide tissue along the bone instead of swelling around it. nx_flexbody <in.nxmesh> <out.nxmesh> <flex_deg> [band_lo_permil] [band_hi_permil] nx_flexbody selftest license_tier: ORIGINAL expect_exit: 0 No hw writes (Rule 26).