nx_pose_cnn_gate.nx

nx_pose_cnn_gate.nx -- executed proof of the sovereign f32 pose-CNN FORWARD PASS end-to-end into the integer keypoint back-half. A tiny 8x8 single-channel image with impulses runs through a REAL 3x3 f32 conv backbone (identity weights, so the peak is predictable while the full 9-tap f32 multiply-add path is exercised) + a REAL 1x1 f32 pose head, then the ReLU'd f32 heatmap is fed DIRECTLY (order-isomorphism) into nx_pose_keypoints. Proves: forward peak + quarter-pixel subpixel through the conv, ReLU zeroing, the f32-bits occlusion threshold, the ReLU unit behavior, and (C5) that the ReLU is LOAD-BEARING -- integer argmax picks the wrong cell on a raw negative activation and the right cell only after ReLU. expect_exit: 0