A cream-base silver-gelatin Wet Lab production still, 4:5 portrait: gloved hands steady a translucent workflow-persistence specimen on a black steel tray, its checkpoint chambers connected to duplicate paper-action strips and one hairline split opening toward a second tool port. A physical hex-lattice tray supports the specimen; deep near-black surrounds it under a hard side key, analogue and tube-amp warm. A short phosphor-green band of checkpoint vials is the only accent. Numbered callouts mark the checkpoint valve, exactly-once membrane, and concurrent-resume seam. An ordinary office stapler holds two identical receipt strips beside the tray, domestic and wrong. One small Bureau seal struck once, lower corner. No readable caption text. Output in exactly 1122 x 1402 px, 4:5 portrait ratio.