One stamp per shipped event (not per unit), 0.4s, sized by count, in the item's
chip colour. Composited in screen space so a melting feed never drags the placard.
Scram events get the one-frame TRACKING LOST bar, positioned from entity+tick so
a run always wipes the same way.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
