UrdaVarg Energy surface-cable reference
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This test build studies/adapts the surface-wire connection concepts used by Wired Redstone
(Kneelawk/WiredRedstone, branch 0.7.x-1.20.x), licensed under the MIT License.

Reference project: https://github.com/Kneelawk/WiredRedstone

Relevant design finding used in this test:
- Wired Redstone distinguishes same-face/external/corner/internal connectivity.
- Its multipart system permits two sided wire parts in the same block for internal/concave corners.
- UrdaVarg's current cable remains a normal block rather than a multipart container, so this test
  specifically improves direct perpendicular surface-neighbour recognition without replacing the
  entire Energy network architecture.

No Wired Redstone assets are included.
