GCV: Numerical selection of Λ_eff on the GR-exact branch — Step 5 (v5.0.0) (Zenodo Mirror)

v5.0.0 (Step‑5) of the “GCV Numerical Λ_eff selection” pipeline. Step‑2 is held fixed and treated as the late‑time selection posterior P_sel(x) for x ≡ Λ/Λ_obs. UV anchoring is held fixed (bundled workbook; discretuum gap proxy x_min,UV). New in this release: • A single positive‑Λ measure proxy (Press–Schechter–motivated erfc form), anchored at x=1. • The prior phenomenological detectability window is replaced by a minimal operational capability model: SN‑like Fisher forecast for θ=(ln x, Ω_m, 𝓜), with σ_{Ω_m} marginalized on [0.02, 0.10] (recommended log‑uniform hyperprior; uniform sensitivity also provided). Reproducibility: • Single reproduce script + Windows RUN_TEST_WINDOWS.bat. • Versioned outputs: results/ (CSV+JSON), figures/, and PUB/ exports. Interpretation note: capability is defined on the accelerating branch (x>0), so Step‑5 posteriors are conditional on x>0. Project homepage: https://johansson.digital Project overview hub: https://github.com/gcv-framework/gcv-vacuum-energy