Radiatively Stable General Relativity with a Flux-Fixed Cosmological Constant (GCV): A structural backbone and CCP synthesis interface for flux-fixed GR

Version note (v1.2.0):Reframes the one-page note as the structural backbone and entry-point interface for the GR-exact branch of the Gauged Constant Vacuum-Mode (GCV) programme after the programme-level CCP synthesis closeout. No new calculations are introduced. Relative to v1.1.0, this update: (i) clarifies the note-level vs programme-level scope, (ii) positions the record within the modular CCP programme, (iii) adds explicit observed-value localisation wording for the residual cosmological constant Λ\LambdaΛ, and (iv) updates the curated companion-record map. This record provides a one-page, journal-neutral structural statement of the GCV framework on its GR-exact branch, together with a minimal falsifier interface and a compact map to the broader programme synthesis. Core claim.GCV realises a GR-exact structural branch in which the strictly spacetime-constant vacuum mode is gauge/flux-controlled and does not appear as a local gravitational source (not a parameter redefinition). Local dynamics remain GR-exact with a flux-fixed integration constant Λeff\Lambda_{\rm eff}Λeff in the Einstein equations, while the local stress-energy tensor Tμν(loc)T^{(\mathrm{loc})}_{\mu\nu}Tμν(loc) contains only local excitations, excluding strictly constant vacuum contributions. Once Λeff\Lambda_{\rm eff}Λeff is inferred from late-time geometry, the background expansion on this branch is indistinguishable from flat Λ\LambdaΛCDM (wDE=−1w_{\rm DE}=-1wDE=−1). Scope.At the note level, this record states the structural backbone of the GR-exact branch: constant-mode gauging, Λeff\Lambda_{\rm eff}Λeff as a flux-fixed integration constant, and the EFT-level radiative-stability claim for strictly spacetime-constant vacuum contributions within the stated operator inventory. At the programme level, this backbone is combined with separate magnitude-localisation and positive-Λ\LambdaΛ modules, yielding the modular CCP closure claim referenced here. What this record does not claim.It does not claim a unique UV completion, a unique continuous first-principles endpoint for Λ\LambdaΛ, or a UV theorem fixing the sign of Λ\LambdaΛ. In the broader programme synthesis, the observed-value result is instead a narrow UV-selected discretuum near the observed scale, and the positive sign is treated through a separate late-time viability module. Practical use.This one-pager is intended as the stable entry point for readers, editors, and survey-facing users who want:(1) the structural GCV claim in one page,(2) the minimal falsifier map, and(3) a compact route into the flagship CCP synthesis and the main companion records. Project homepage: https://johansson.digitalProject overview hub: https://github.com/gcv-framework/gcv-vacuum-energy