1799 - continue to debug memory corruption of 1795

Things I figured out:
- 'row' in render-screen doesn't perfectly track cursor-row in screen
- proximal cause was forgetting to add left:number to stop-printing
- trying to print to screen outside bounds was silently succeeding and
  corrupting simulated memory
- if we silently ignore prints outside bounds things are fine

But why are prints outside screen bounds working? We should be accessing
screen data using 'index', and that's checking its bounds.

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