Protocol loop actually loops (cap 3)

[kgraph57]

Summary

• When Adversarial enters view, a marker runs the 2→5→2 rectangle three times (the correction cap), then exits toward step 6.
• Lap label updates 1/3, 2/3, 3/3. No scroll-jack.
• Reduced motion: static track only.

Test plan

• Scroll to step 5 — a dash circuits the loop three times
• Label reads loop 3 / 3 · then 6
• Reduced motion: no travel