Initial README

README.md

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+# bench_score
+
+Per-(prediction-repo-sha × model) IoU-24 scores for the BenchCAD/cad_bench_200
+benchmark. Updated by `eval/remote_iou24_service.py` (see cadrille repo).
+
+Layout:
+```
+per_case/{sha[:8]}/{model}.parquet   # one row per stem
+summary.parquet                       # rolled-up by (sha, model)
+```
+
+Per-case parquet schema:
+  sha_short, model, stem, code_hash, iou, iou_24, rot_idx, exec_ok,
+  reason, latency_s, scored_at
+
+Summary schema:
+  sha_short, model, n_total, n_exec_ok, exec_rate,
+  mean_iou_24, median_iou_24, pass_iou_24_0.5, pass_iou_24_0.7,
+  updated_at