docs: add direct benchmark workflow

Document the copy-paste download and 166-case runner command from the Mesh Untangling repository root.

README.md

@@ -24,8 +24,7 @@ It contains 166 input meshes:
 | Microsoft Rocketbox | 140 | OBJ and companion MTL | MIT |
 
 These are benchmark inputs and may contain self-intersections. They are not
-solver outputs and are unrelated to the separately announced intersection-free
-mesh dataset.
+solver outputs.
 
 ISIR, SMAL, and SCAPE are not included because their distribution terms require
 users to obtain the data from the respective owners.
@@ -46,18 +45,28 @@ SHA256SUMS
 `metadata/included-cases.json` records the 166 canonical OBJ paths and hashes.
 `SHA256SUMS` covers every distributed OBJ and MTL file.
 
-## Download
+## Download and run
+
+Install the Hugging Face CLI if needed with
+`python3 -m pip install --upgrade huggingface_hub`. From the Mesh Untangling
+repository root, run:
 
 ```bash
 hf download AppledoreM/Mesh-Untangling-Benchmark \
   --repo-type dataset \
-  --local-dir Mesh-Untangling-Benchmark
+  --local-dir benchmark-data
+
+python3 scripts/run_untangle_benchmark.py \
+  --data-root benchmark-data/data \
+  --output-root output/public-benchmark \
+  --forward-flow-binary build/bin/Release/mesh-untangle \
+  --reverse-flow-binary build/bin/Release/reverse-flow \
+  --case 'math/*' \
+  --case 'Microsoft-Rocketbox/*'
 ```
 
-To use these files with the release benchmark, copy the two directories under
-`data/` into the data root used by the Mesh Untangling repository. The remaining
-three datasets must be acquired separately before running the complete 343-case
-manifest.
+Run from the Mesh Untangling repository root, keep the case globs quoted, and
+choose an output directory that does not already exist.
 
 ## Integrity