A belt's asteroids circle its orbit's parent, so a belt reaches the chain's reach to that orbit plus its Radius
(AsteroidBelt.Radius, the largest asteroid Distance); the chain walk is one function for bodies and belts. The fixture
inserts a smaller body after the outermost so a last-wins bound fails, and a belt beyond the outermost body pins the
belt term. Builds; Unity-side files are in the next commit.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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