Add dataset card

README.md

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+---
+configs:
+- config_name: default
+  data_files:
+  - split: test
+    path: data_bench_v1/test-*
+---
+
+# Material Replacement Bench v1.0
+
+Frozen evaluation split for the interior-design material-replacement
+benchmark: 1421 task specs (mask-aligned, watermark-free), of which
+1093 are `gt_clean` (the stored `output` edits only the mask and
+matches the reference; the rest keep `output` as a non-exemplar reference
+solution only).
+
+Task: given `input` + `mask` + `reference` (or the mask-free `instruction`),
+replace the masked object's material and change nothing else. Evaluation is
+reference-free — outputs are scored on material correctness, outside-mask
+preservation, geometry preservation, and lighting harmony, never on pixel
+similarity to `output`.
+
+Columns: `instruction` (rewritten, image-faithful), `material_category`,
+`surface_type`, `mask_target_seen`, `mask_coverage`, `coverage_bucket`,
+`gt_clean`, plus the four images.
+
+Provenance: fully synthetic quadruples generated with OpenAI image models
+via codex; curated from `Elfsong/vinhome_material_replacement` (algorithmic
+QC + VLM semantic QC + instruction relabeling; see `curation/` there).
+Frozen 2026-07-20. Research use.