Spin-Suppressed Evaporation Invariant: Total D3 Displacement for Kerr Black Holes and Unification of the D3 Research Series

We extend the evaporation invariant to rotating (Kerr) black holes. The total D3 information-geometry displacement over complete Hawking evaporation is R_total(Kerr) = f(χ)·r_s(M₀), where f(χ) = 2√(1−χ²)/(1+√(1−χ²)) is the spin-suppression factor. Five constants cancel (M, ℏ, k_B, ln2, π) — only G, c, and f(χ) survive. This unifies all four papers: at χ=0 the Schwarzschild invariant is recovered; at χ→1, R_total→0. Verified across four mass decades and seven spin values including GW150914, GRS 1915+105, and Sgr A*.