Organize PROWBench inputs for browsing

README.md

@@ -43,7 +43,7 @@ PROWBench provides structured conditioning inputs for video/world-model evaluati
 
 ## Representative images
 
-These examples show the distinction between recorded RGB first frames and frames extracted from proxy input videos. The same images are embedded in the Parquet `preview_image` column for the selected samples.
+These examples show the distinction between provided RGB first frames and frames extracted from proxy input videos. The same images are embedded in the Parquet `preview_image` column for the selected samples.
 
 | Group | Preview | Source |
 |---|---|---|
@@ -59,7 +59,7 @@ The videos in this repository are **proxy input videos**, not generated model re
 
 The `full` split has one row per representation sample (600 rows). The other five splits select rows from that same index by group; they are **not additional samples**. Each row includes the episode, camera, representation, prompt text, paths to directly downloadable files, source paths, SHA-256 hashes, and visual-revision indicators.
 
-The `preview_image` column uses the Hugging Face `Image` feature. It contains **one representative image per episode** (170 total), attached to the selected `mixed` sample; the other representation rows have no image in that column. For 60 episodes the image is the recorded RGB first frame (`preview_kind=rgb-first-frame`). For 110 episodes without one, it is the first frame of the selected proxy input video (`preview_kind=proxy-video-first-frame`). A proxy preview is **not** an RGB conditioning first frame. The image bytes are embedded in Parquet for the Dataset Viewer and the file path is available in `preview_file`. Private Viewer availability depends on Hugging Face account or organization support; the files can still be downloaded directly.
+The `preview_image` column uses the Hugging Face `Image` feature. It contains **one representative image per episode** (170 total), attached to the selected `mixed` sample; the other representation rows have no image in that column. For 60 episodes the image is the provided RGB first frame (`preview_kind=rgb-first-frame`); `first_frame_kind` distinguishes benchmark-generated anchors where applicable. For 110 episodes without one, it is the first frame of the selected proxy input video (`preview_kind=proxy-video-first-frame`). A proxy preview is **not** an RGB conditioning first frame. The image bytes are embedded in Parquet for the Dataset Viewer and the file path is available in `preview_file`. Private Viewer availability depends on Hugging Face account or organization support; the files can still be downloaded directly.
 
 ```text
 splits/                   Parquet sample index: full + five group splits

SHA256SUMS

@@ -1,4 +1,4 @@
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