- system.py runs app.Loop() on the script fiber; each UIUpdate is one
CPythonApplication::Process(). Logo -> Login, popup ESC/click and
app.Exit teardown (launcher cleared first, as in 40250 Main) work.
- Image commands are base-texture quads with UVs (a .sub shares its parent
texture); ImageInstance/ExpandedImageInstance OnRender and SetRenderingRect
ported verbatim, so scale/rotation/rendering rect are drawn.
- CGraphicBase::GetColor / grp.GenerateColor ported (ThinBoard background).
- port.app_loop test, python_host_test app-loop checks, MT_TEST_MODE=python_ui.
- TODO: .fnt/CGraphicText font pipeline, ExpandedImage blend modes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
