ludic/changes/ui-mounted.md

bump: minor type: feature ui_mounted and ui_model_of: an editor's questions of a running interface. ui_mounted(out) fills the caller's list with the classes of the components the last frame showed, in tree order and each once; ui_model_of(cls) is the first mounted instance's model, read in place (the next frame fills it again), or null. For devlink's ui_screen and ui_model; asked on request, never a frame.