The Arduino_OS.ino contains the "OS" code and example code (standalone project). The simple example code is at the bottom of the module.
"intuitively obvious to the most casual observer"
I am not in a business since I am only 14 years old. I believe that the Arduino can run a simple OS.
I believe that the Arduino can run a simple OS. It has more resources than an Apple I!
That's true, but the Arduino has more processing power. I think I'll just try a few things on the Arduino to test the idea, then port the whole program to a board with more capabilities, like the Raspberry Pi.