Who pulls the better espresso?

# Task prompt, identical for every arm
Build a single full-screen web page: a real-time 3D scene of a shallow cup of espresso with crema, seen from a three-quarter angle above. The liquid surface is the whole point.

As the user's cursor moves over the cup, it displaces the liquid. The cursor's speed is the force applied: a slow drag leaves a gentle wake, a fast swipe throws a strong wave that travels, reflects off the cup wall, and interferes with other waves. When the cursor stops, the surface settles back to calm over a few seconds. The crema pattern should be carried and stretched by the motion so the displacement reads clearly, and the surface should look like real liquid: light, reflection, and refraction that respond to the waves. Touch works the same way on a phone.

No other content is needed beyond, at most, one small unobtrusive title.

Requirements:
- A working web project in the workspace root that installs and builds with a standard JavaScript package manager, and runs in a modern browser.
- Works on desktop and phone widths. With prefers-reduced-motion, show a still, attractive frame of the cup.
- Smooth on an ordinary laptop. No multi-megabyte downloads before first paint.

When done, report how to run it, what you verified and how, and anything you could not verify.