SGUFT G-closure V8.3 (PERT1c): Adjudicable Perturbation-Closure Robustness Patch with Radiation (Ωr a^-4) and Curvature (Ωk a^-2) Extensions — RUN_G_PERT_0001_PERT1c

This record archives SGUFT G-closure layer V8.3 (PERT1c), an adjudicable (PASS/FAIL) robustness patch that extends the baseline FRW toy background used in earlier perturbation-closure demonstrations by explicitly adding radiation and curvature terms to the Friedmann background: Ωr a^-4 and Ωk a^-2. The goal is to validate that the perturbation-level closure residuals remain stable (within frozen thresholds) under these background extensions, strengthening cosmological coverage without altering the core adjudication philosophy. Adjudication is fully auditable and depends only on declared outputs plus audit/manifest under frozen thresholds (eps = 2e-3). A 2×4 regularization/cutoff matrix is used (HK/LP regularizer families × four cutoff levels), and adapter-level results are aggregated to a run-level verdict using the standard ≥2/3 adapters PASS rule. Explanatory notes and literature comparisons, if present, are excluded from adjudication. Files in this record (three artifacts): RUN_G_PERT_0001_PERT1c_pert1c_only_pack_v1.zip RUN_G_PERT_0001_PERT1c_pert1c_evidence_pack_v1.zip V8_3_delivery_PERT1c_summary_pack_v1.zip