feat(G2): Add G2 geometry #1
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Add 4 files with rigorous G2/E8 mathematics: - G2/CrossProduct.lean: 7D cross product and Lagrange identity - G2/E8Lattice.lean: E8 lattice properties and Weyl reflections - G2/RootSystems.lean: E8 root enumeration (|E8|=240) - G2/Geometry/Exterior.lean: Exterior algebra on R7 All files are sorry-free and axiom-free. Author: Brieuc de La Fournière
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Add 4 files with G2/E8 mathematics:
All files are sorry-free and axiom-free.
Author: Brieuc de La Fournière