Support for wrap-around maps

In games where some teams start along along edge of the map, and some teams starting in the middle, I find that teams in the middle often get squeezed, as they are the closest opponent to all teams on the edges.

If the map wrapped around, so the opposite edges were linked, it would make for interesting, and perhaps more balanced play.

I realize that this is kind of counter to the idea of infinitely generating terrain, but as I imagine that a mode for set-size maps would make sense, in that context wrap-around maps could also be an idea.

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The issue names no files, tests, or entry points. Start by locating map-boundary handling and any support for fixed-size maps, then determine how terrain generation and gameplay coordinates would represent linked opposite edges. Done would mean a defined wrap-around map mode with balanced edge traversal and documented tests or acceptance criteria.