Three tests in MiningIndexTests, no production change. RegionsStayNearTheSearchArc bounds the share
of a small search's regions that lie past reach on both sides (window widened, nearest loosened);
VisibilityBoundPrunesADimBelt bounds rocks examined against rocks in reach in a half-lit belt of
largest rocks; ARockExactlyAtReachIsFound searches from 1-300 units with reach set to a rock's exact
distance, a third of them radially outward from a belt's outermost rock. Each threshold's unmutated
and mutant values are in its comment.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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