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Development/CI harness for a second independent LeanFrontier extension. Do not merge this fork-local PR.
Exact base:
main @ 9f708c18fccb311646b10af124c60ca70e41857bCandidate adds exactly:
LeanFrontier/Geometry/FordCircleTangency.leanSubmissions/ford-circle-sphere-tangency.jsonEntrypoint:
LeanFrontier.FordCircle.isExtTangent_euclideanSphere_iffThe accepted FordCircle module explicitly leaves the bridge to Mathlib
EuclideanGeometry.Sphere.IsExtTangentas separate work. This candidate represents Ford circles as Euclidean spheres inℂand connects Mathlib external tangency to the accepted cross-determinant-square criterion.This PR is only a CI harness. Keep it unmerged; if receiver validation and adversarial review pass, the real submission goes to
carlok/LeanFrontier.