Delete deprecated dispute game contracts after super root contracts ship

This issue has no description.

The issue names no files, tests, or entry points, so first locate the dispute game and super root contract implementations and determine where their deployment or build references live. Confirm that the super root contracts have shipped and identify every deprecated contract reference before removing them; done means the deprecated contracts and their references are gone without breaking the contract build or tests.

Written by the indexing model from the issue text.