nx_gt_annotations_gate.nx

nx_gt_annotations_gate.nx -- ★R2 of the Infinigen ladder: the GROUND-TRUTH ANNOTATION SUITE (their flagship use-case: synthetic data for CV training, per the banked GroundTruthAnnotations doc title). Our renderers know everything at hit time -- this gate proves we EMIT it: per-pixel DEPTH + SEMANTIC SEGMENTATION (sky/terrain/ water/tree/animal/person) + INSTANCE IDs + SURFACE NORMALS + OCCLUSION BOUNDARIES (depth discontinuities). Flow needs animation (R4) -- named residual, not claimed. T1 world GT: seg classes 0/1/2 present with sane counts; terrain normals unit-length; sky normals zero T2 scene GT: 3 placed objects (tree/animal/person) paint classes 3/4/5 + DISTINCT instance ids 1/2/3 T3 occlusion boundaries: depth-discontinuity edges exist in a sane band + PNG knowledge/nx_gt_panel.png (colour | segmentation | normals | depth+occlusion) + determinism of the GT buffers license_tier: ORIGINAL expect_exit: 0