proof
P31 Safe agent selected against
Lean spine source
formal/AlignmentProofSpine/Adversarial.leanFrom the machine-checked spine in formal/ (core modules are Mathlib-free;Field/Finite/ may import Mathlib). Not self-contained for Lean 4 Web — use the repo or a local lake build.
theorem P31_safe_agent_selected_against :
∃ safe risky : Bool,
ToySafe safe ∧ ¬ ToySafe risky ∧
ToyDeploymentMass defaultEnvironment risky >
ToyDeploymentMass defaultEnvironment safe :=
⟨true, false, rfl, by decide, by decide⟩