Executable Electroweak Predictions from a Frozen GCFT D02 Operator: From Exact Amplitudes to a Six-Leg Integrated Observable

This paper consolidates GCFT-0545 through GCFT-0554 into an immutable, executable electroweak calculation. A frozen D02 interaction is propagated from authoritative operator definition through exact on-shell amplitudes, normalized two-body observables, EFT and coupled-channel unitarity checks, off-shell conserved-current embedding, six-leg leptonic amplitudes, and independently validated four-body phase-space integration. The final benchmark is the idealized monochromatic charged-current process \(e^-\mu^+\to\nu_e\bar\nu_\mu\Xi\Xi^*\), evaluated only within the conservative EFT domain. The paper retains two fail-closed corrective records as methodological evidence. It makes no collider, experimental, relic-density, or preferred-parameter claim.