draw_axes projected with raw project_point3, so a behind-camera axis endpoint wrapped to a finite mirrored point (proven: clip.w=-100 projected to screen centre). Extracted shared project_point with the eye-plane guard (grid_segments delegates verbatim) and axes now skip when an end is unprojectable plus clip_seg. Legacy canvas offset preserved pixel-identically; remaining raw project_point3 sites elsewhere are out of scope. Tests: project_point_rejects_behind_eye plus axes_segments geometry pins. Full suite: 2024 passed / 0 failed / 25 ignored.