feat: add Pascal's theorem eval problem#408
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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
…e meet points); keep Pascal
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…t already dropped)
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This PR adds two projective-geometry incidence theorems (§146 of the Knill survey): Pascal's theorem (six points on a non-singular conic give three collinear intersection points) and Pappus's hexagon theorem (the degenerate-conic case, two triples of collinear points). The trusted helpers (
SamePoint,OnConic,meet,Collinear3) are non-holes, built on Mathlib's cross product⨯₃. Neither theorem is in Mathlib.🤖 Prepared with Claude Code