SGUFT G-closure V15.2 (COS-SIN1b): Adjudicable Cosmological Contraction-to-Singularity Robustness Patch with Radiation and Curvature Extensions (Ωr a^-4, Ωk a^-2) — RUN_G_COSSIN_0002_COSSIN1b

This record archives SGUFT G-closure layer V15.2 (COS-SIN1b), an adjudicable (PASS/FAIL) robustness patch extending the cosmological contraction-to-singularity-neighborhood evolution demonstrator by explicitly incorporating radiation and curvature terms into the FRW background: Ωr a^-4 and Ωk a^-2. The purpose is to test whether the key dynamical adjudication structures remain valid under broader cosmological backgrounds: (i) classification of unregularized divergence behavior near the contraction endpoint, (ii) audited convergence of regularized proxies under a frozen 2×4 regularization/cutoff matrix (HK/LP × four cutoff levels), and (iii) persistence/emergence of isolation/reachability surrogates as contraction proceeds. Adjudication depends only on declared outputs together with audit/manifest under frozen thresholds (eps = 2e-3). Run-level verdicts follow the standard ≥2/3 adapters PASS rule. Explanatory or observational comparisons, if present, are excluded from adjudication. Files in this record (three artifacts): RUN_G_COSSIN_0002_COSSIN1b_cossin1b_only_pack_v1.zip RUN_G_COSSIN_0002_COSSIN1b_cossin1b_evidence_pack_v1.zip V15_2_delivery_COSSIN1b_summary_pack_v1.zip