Update card: dataset present (1047 ep, 1M steps)

README.md

@@ -23,11 +23,14 @@ dataset.
   [ccnets/causal-gpt-rl-unity-envs](https://huggingface.co/datasets/ccnets/causal-gpt-rl-unity-envs)
 - Policy (ONNX): [ccnets/causal-gpt-rl-unity](https://huggingface.co/ccnets/causal-gpt-rl-unity)
 
-## Status
+## Contents
 
-> **Pending upload.** The trajectory artifact is not in this repo yet; this card
-> documents the layout and the recipe that produces it. The recipe below
-> regenerates the dataset from the public materials at any time.
+- **1,047 episodes · 1,000,000 transitions.** Minari HDF5 at
+  `crawler/expert-v0/data/main_data.hdf5` (+ `metadata.json`), plus
+  `crawler/namespace_metadata.json` for the `unity` namespace.
+- Observation `Box(158)`, action `Box(20, [-1, 1])`, `minari_version` 0.5.3.
+
+The recipe below regenerates this dataset from public materials at any time.
 
 ## Reproduction recipe