Read the sources from disk instead of a hand-maintained allow-list that the
script uses destructively, and add a guard that fails when the project and
directory disagree. FlutterNativeTextInputTests.mm was the second test the
list would have silently unwired.
Introduces shared seams for paginated views, D-pad reorder, media control
routing, async singletons and the device method channel, then points the
open-coded copies at them.
Also removes unused models and duplicated provider/server plumbing, folds
the twice-implemented artifact store in the server, and factors the
repeated Flutter toolchain prologue in CI into a composite action.
edde746