One sphere, one point light, seventy lines: example/lib/minimal_main.dart
opens its device through flutter3d_backend the way a new application
would, and example.md puts those lines on pub.dev's Example tab in
place of the four-thousand-line model browser. A smoke test runs the
file headless through the software fallback, so CI checks the claim the
file's own comment makes. The example's README stops being the
flutter create stub, and flutter3d goes to 0.4.1 to carry all of it
to pub.dev.