[Exelord]

The landing race did not always play.

Cause

• The runners moved through the Web Animations API while starting display: none.
• One observer paused and resumed them from its first queued entry, which can be stale.
• A second observer, with a different margin, decided whether the runners were shown.
• At the band's edge the two disagreed: laps counted over static bars.

Fix

• One frame clock moves the runners and counts the laps (race.ts, pure).
• Whether it runs is read from where the band is now, on scroll, tab change and page restore.
• The runners show from the class the clock itself sets.

Checks

• tests/landing.test.ts: lap arithmetic, the on-screen rule, the frame cap, the lane data.
• Chromium probe, 11 cases (fast scroll, anchor load, edge only, reload, back, tab hide, phone): all move; still when off screen.
• Reduced motion keeps the static bars, as before.
• Safari and Firefox are not installed here, so untested.

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Generated by Claude Code