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Q2Presentation.Induction.XRLayerKeep

The consolidated XR-layer statement, PROVEN (prop:defduality at the Frattini layer in the 𝒳_R = 0 branch; manuscript l.4207–4262): given no nonzero C-invariant duals on the raw R-module, the row system at the Frattini kernel is surjective at every frame-compatible marking (five-lemma + structured simple sections + the Bockstein step), and invariant duals vanish in the consumer spelling (transport).

theorem Q2Presentation.Induction.sec7_xrzero_cochainData_proven {p : FramedPair} (h : ¬ScalarTerminal p) (chief : FirstNonScalarChiefFactor p) (K : KernelMinimal chief.toNonScalarChiefFactor) (hR : 1 < Nat.card ↥(kernelFrattini K)) (hchar : ¬∃ (lam : Module.Dual (ZMod 2) (sec7RawTowerPacketCanonical chief K).rawModuleData.R), lam ≠ 0 ∧ ∀ (c : (sec7RawTowerPacketCanonical chief K).rawModuleData.C), lam ∘ₗ ↑((sec7RawTowerPacketCanonical chief K).rawActionData.actR c) = lam) :

The XRZero cochain keep, PROVEN from the consolidated XR-layer keep and the canonical local-duality keep, with kdim := dim R.