The pre-rotation patches landed in the previous four commits. This
records how the debt was paid, by a fourth route its own list missed:
patching wgpu-hal and Slint's Skia surface locally rather than waiting
for either upstream. It also updates architecture.md §1 and §6.1, which
still said Android draws with OpenGL behind a readback.
The verification is stated as what it was: the user found the
release-signed build clean on the tablet in portrait. No dumpsys
composition or bufferTransform readings were taken, because adb would
not hold the device that morning, and no frame times were measured.
dtourolle
b480de5bff