nx_anatomy_measure.nx

nx_anatomy_measure.nx -- measure named anatomical axes from binary mask. Composes existing primitives (no duplication): - nx_color_skin_mask (already in nx_color_v2) - nx_region_segment (already in nx_region) - nx_eye_detect (Layer 7, KEYSTONE) Cross-section measurement is the central technique here: - bust = widest mask-width across upper torso Y-band - waist = narrowest mask-width across mid torso Y-band - hip = widest mask-width across lower torso Y-band - navel = darkest pixel along torso vertical midline Output: flat-array (axis_id, value_px) bundle ready for nx_beauty_score(). All primitives are flat-array-API to avoid the nxc2 codegen bug with struct-pointer returns.