Document SODA 2026 structural DAG repairs

README.md

@@ -873,3 +873,28 @@ This was **cycle-only** remediation, not a full re-validation or re-DAGification
 </details>
 
 <!-- cycle-repair-note:end -->
+
+<!-- soda-structural-repair-note:start -->
+## SODA 2026 structurally validated DAGs
+
+The `SODA_2026` split [`legacy_v1_6_structurally_repaired_gemini_3_8_flash`](https://huggingface.co/datasets/AI-Math-TCS/tcs_dags/viewer/SODA_2026/legacy_v1_6_structurally_repaired_gemini_3_8_flash) contains 142 DAGs derived from the earlier cycle-only split. Of these, 56 needed no further structural change, 75 received bounded edge-only repairs by Gemini 3.8 Flash (medium effort), and 11 with missing overview roots were regenerated from the corresponding paper PDFs using the full parsing and DAG pipeline. Every row passes deterministic checks for unique node IDs, one overview root, valid edge endpoints, no directed cycles, exactly one primary parent per non-root node, and primary-path reachability to the root.
+
+The `was_structurally_repaired` and `was_regenerated` columns distinguish the two interventions. `original_structural_issues`, `structural_repair_log`, `regeneration_reason`, `regeneration_source_paper_id`, and `regeneration_cycle_repair_log` provide per-paper provenance. The existing `had_cycles` column describes cycles in the original legacy graph *before* the earlier de-cycling pass; it is historical and does not mean that the new DAG contains cycles. The original cycle-only split remains available, and its DAG payloads are unchanged.
+
+<details><summary>11 regenerated papers</summary>
+
+- `approximately_dominating_sets`
+- `approximating_matroid_basis`
+- `better-than-2_approximation_directed`
+- `centered_colorings_minor-closed`
+- `erd_s-p_sa`
+- `expander_pruning_polylogarithmic`
+- `lower_bounds_universal`
+- `online_3-taxi_general`
+- `quantum_state_preparation`
+- `vizing_theorem_deterministic`
+- `weighted_k-server_admits`
+
+</details>
+<!-- soda-structural-repair-note:end -->
+