PROJECT T VOLUME XXVIII : The Chromatic Transmutation Golden Ratio Emergence from the ℤ₃ Decomposition of the Algebraic Crystal

We decompose the 24 phonon modes of the algebraic crystal (truncated octahedron realization of H₀(A₃)) into the three irreducible representations of the ℤ₃ symmetry inherited from the quasi-Hopf triple structure of H₀(Ã₂). The decomposition is performed via the chromatic transfer operators Tₖ = Lₐ + ωᵏ·Lᵇ + ω²ᵏ·Lᶜ, where ω = e2πi/3. The central result is the Chromatic Transmutation Theorem: the chromatic operator T₁ has exactly 24 eigenvalues distributed on four concentric circles in the complex plane, with moduli {1/φ, 1, φ, ∛9}, where φ = (1+√5)/2 is the golden ratio and ∛9 = 3²″³ = K²″³ ≈ 2.0801. Each circle carries exactly 6 eigenvalues at 60° intervals (algebraically exact, by ℤ₃ × ℤ₂ symmetry). The complex eigenvalues on the φ-circle are ±φ·e±iπ/3, with Re = ±φ/2 = ±cos(36°) and Im = ±φ√3/2. This reveals that the ℤ₃ rotation from the quasi-Hopf structure transmutes the √2 arithmetic of the crystal graph into the golden ratio φ of the chromatic sector. The invariant sector (T₀ = T) sees √2; the chromatic sector (T₁) sees φ. This unifies Volume III (φ from lexical counting 42/33 ≈ √φ), Volume XII (crystal vibrations with √2), and Volume V (the quasi-Hopf triple). All results are computationally verified with zero free parameters.