SFVdSB/SFVdSB_LIV_Fast_Track_Companion_FT1_and_FT2: SFV/dSB LIV Fast-Track Companion (FT1 and FT2)

This companion article consolidates two "fast-track" deliverables for placing SFV/dSB Lorentz violation (LIV) into the Standard-Model Extension (SME) ecosystem without completing full multi-sector certification. FT1 upgrades the Option-A photon result to an SME-facing prediction with a sign-fixed quartic deformation, derived from bounce-controlled gauge localization and heavy-mode (tower) elimination. FT2 addresses the standard radiative-stability objection (Collins-type naturalness critique) in a "WP6-lite" manner by contrasting a conservative hard-cutoff diagnostic with a model-faithful matching+running scheme anchored to the bouncederived tower gap scale E⋆. All numerical values and command-line invocations reported here correspond to the public scripts and JSON outputs included in this companion repository.