🧩 Wrap-Around Mode / Portals

[NickTheDevOpsGuy]

Description

Enable a mode where the snake exits one edge and re-enters from the opposite side.
Goal: boundary math and conditional world wrapping.
Test: head leaves right edge → appears on left edge.

Proposed Solution

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Screenshots / Mockups (optional)

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Additional Context

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Checklist

• I searched existing issues for duplicates
• This issue includes enough detail to act on