The definition metaForcedArithmeticInvariance reifies the Universal Forcing Meta-Theorem inside the meta-realization on MetaCarrier (the type of LogicRealization.{0,0} instances).
It states: for any R, S : MetaCarrier, there exists a canonical equivalence R.Orbit ≃ S.Orbit, obtained by direct application of universal_forcing_via_NNO R S.
This supplies the forced_arithmetic_invariance field of MetaRealizationCert.
Reflexivity holds by metaForcedArithmeticInvariance_self: metaForcedArithmeticInvariance R R = Equiv.refl R.Orbit, proved via recursor uniqueness on the NNO structure of R.Orbit.
The construction is used in framework_is_reflexively_closed to establish that the meta-cost satisfies the three Aristotelian conditions and the meta-theorem supplies the invariance law, closing the framework structurally.