Radiatively Stable General Relativity with a Flux-Fixed Cosmological Constant (GCV): A minimal structural claim, modular mapping, and survey-facing falsifiers

Version note (v1.0.1): Scope clarification only (no new numerics): makes explicit that this audit guide separates (i) the EFT‑level radiative‑stability claim on the GR‑exact branch from (ii) any global selection/typicality/measure model over flux sectors, which is only needed for distributional predictions of realised ΛeffΛeffΛeff. This record provides a concise, journal-neutral audit guide for the Gauged Constant Vacuum-Mode (GCV) framework on its GR-exact branch, including the minimal late-time deformation interface and survey-facing falsifiers intended for independent verification and reporting. Core claim. GCV realises a GR-exact branch in which the strictly spacetime-constant vacuum mode is gauge-controlled and does not appear as a local gravitational source. Local dynamics remain GR-exact with a flux-fixed integration constant Λ_eff in the Einstein equations, while the local stress-energy tensor T⁽ˡᵒᶜ⁾μν contains only local excitations (matter/radiation perturbations), excluding strictly constant vacuum contributions. Once Λ_eff is fixed by late-time data, the background expansion on this branch is indistinguishable from flat ΛCDM (w_DE = −1). Scope. This note: states the structural GR-exact claim and defines the minimal late-time interface: an optional, growth-only excitation response sector on a fixed GR+Λ_eff background, specifies a UV → EFT → ε mapping interface used to translate UV assumptions into (i) an operator inventory consistent with the GR-exact branch and (ii) a restricted late-time response template family g(z), formulates late-time observational tests and falsifiers in ruler-free geometry and growth observables (including the growth-tilt sign discriminator), and provides a minimal adoption/reporting checklist to make independent analyses comparable. This note does not: predict the numerical value or sign of Λ_eff; provide a UV-unique completion; claim a detection of deviations from GR/ΛCDM; re-run survey pipelines; or include code listings or numerical work in the PDF. Numerical constraints, likelihood constructions, and reproducibility bundles are provided in the cited companion records. Companion records (supplementary modules). See related works Project homepage: https://johansson.digitalProject overview hub: https://github.com/gcv-framework/gcv-vacuum-energy