test_visibility_texture_update_performance asserted a single wall-clock sample against the 0.5ms budget and blocked two pushes while a live session shared the machine (0.704ms / 0.623ms; 46/46 green in isolation). Median of 5 runs preserves the D-059 budget intent while absorbing load spikes. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>