nx_devpaint_gate.nx

nx_devpaint_gate.nx -- GATE for the derived-scale deviation heatmap and the two root defects it had to fix first (2026-08-26). THE TOOTH THAT MATTERED MOST IS THE ONE THE EXISTING GATES COULD NOT HAVE HAD. nx_mmdev_gate and nx_xport_gate both write their NXMSH2 fixtures through the SAME nx_nxmesh_lib constant they then read back, so the position-unit constant CANCELS and every round-trip tooth passes at any value of it. It passed at a value that was wrong by 1000x for every file a real producer writes, and the consequence was that nx_mmdev -- this estate's exact surface-deviation ruler -- refused every real mesh on its extent bound. So this gate decodes a LITERAL float32 BIT PATTERN that no writer here produced, and carries a neg-control showing the old constant would have refused a 1.594 m human body. The second root defect is the colour codec: nx_mesh2glb decoded a legal colour to zero, tripping its own bone fallback, so every painted heatmap emitted uniformly bone while the organ printed "per-tri colour carried". The neg-control below reproduces that exact expression and requires it to be wrong. license_tier: ORIGINAL