From order-unity to near-unity: a three-bottleneck closeout for Λ selection in flux-fixed GR

This record releases v1. 0. 0 of the closeout/robustness note for late‑time value selection of the effective cosmological constant on the GR‑exact, flux‑fixed branch of the Gauged Constant Vacuum‑Mode (GCV) framework. The analysis works with the dimensionless ratio x ≡ Λ/Λₒbs and starts from the fixed v6 capability‑conditioned posteriors defined in the archived v6 bundle. What this note does Quantifies the baseline Step‑6 behavior (mildly skewed above unity; DETECT has a large high‑x tail). Provides an explicit three‑bottleneck closeout mechanism (not presented as a unique cosmological measure) that yields a pronounced near‑unity interior peak and strongly suppressed tails under modest parameter variation. Defines a fixed, quantitative acceptance gate for UV‑derived, GCV‑compatible “derived‑Λ” candidates, expressed in four metrics: medM, medD, Pband ≡ P (0. 8 5), including “minimum pass” and “Target” thresholds. Headline numbers (recommended configuration) Baseline Step‑6: medians ~1. 44 (MEASURE) and ~1. 62 (DETECT), with a large DETECT high‑x tail. Closeout instantiation: medians ~1. 05 (MEASURE) and ~1. 00 (DETECT) with P (0. 85) ~10^-5–10^-4. What’s included in this Zenodo upload The manuscript PDF + LaTeX source. A minimal reproduction script and the minimal posterior grids needed to validate the closeout summary numbers (see README in the archive). Scope / claim boundaryThis note does not claim a UV first‑principles prediction of Λₒbs or a unique cosmological measure; it provides a fixed acceptance gate and an explicit, disciplined closeout construction to make the next UV stage falsifiable. Project homepage: https: //johansson. digitalProject overview hub: https: //github. com/gcv-framework/gcv-vacuum-energy