Chapter 5: The 4+1 Sector Decomposition at E₃

The abstract 4+1 sector template—discovered in Book III, Part II and instantiated at E₁ (physics, Books IV–V) and E₂ (life, Book VI)—is now concretely instantiated at E₃ (metaphysics). Four pure sectors (S_E, S_P, S_D, S_C) correspond to the four registers of reason. The mixed Logos sector S_L is the unique structural location where proof-validity equals stance-stability. The Sector Decomposition Theorem proves that every E₃-admissible content belongs to exactly one pure sector or to the mixed sector.