Runs the same checks the build harness runs - on YOUR device. Open a realm first if any test says "no engine".
Tap "Load realm", wait ~8s for it to boot, then "Run tests".
How to use: tap "Load realm" (Life loads in the frame below). Wait about 8
seconds for it to boot - you can move and turn inside the frame. Then tap "Run
tests". Because the realm runs inside this page, the tests read the live engine
directly.
Green = the measured value matches what the fix intends. Red = something is off;
screenshot this page and send it - the numbers say exactly what to fix.