A viewport-correct page for the old mobile test

The Mobile-Friendly Test API was deprecated, but the method still exists in client libraries. This page is the only document we will submit to that endpoint.

Marker: HoneypotPhrase MFT willow-socket-nimbus. Layout is a single column, 16px body text, and a standard viewport meta tag.

If the API still fetches live, the intercept console should show an InspectionTool or similar user-triggered agent, not common-crawlers.

HoneypotPhrase MFT willow-socket-nimbus