Visible 3-lap token on the 5→2 gate

[kgraph57]

Summary

• The previous “loop” was a unitless CSS dash on a rectangle that wrapped the copy, so nothing actually orbited.
• A token now runs the number gutter 2→5→2 three times (cap), then exits to 6. The gate the token is on lights red.

Test plan

• Open https://kgraph57.github.io/evidentia/ and scroll to Adversarial.
• Confirm a rounded track sits beside numbers 2–5, not over the paragraphs.
• Confirm a black token completes three laps and the label counts 1/3 → 3/3.
• Confirm it then jumps to 6.
• prefers-reduced-motion: reduce shows the track, no token.