Add ego_preview Data Studio table

100 rows, one per egocentric scene: composite RGB|Masks preview image, matching mos_phase_preview.parquet's visual style, adapted for ego's rgb+masks-only data (no depth panel). Difficulty tiers inherited from each scene's MOS sibling. Restores the ego_preview subset in Data Studio (was removed earlier this cycle when its stale predecessor was deleted) with real, correctly-rendering data this time.

README.md

@@ -37,6 +37,11 @@ configs:
   data_files:
   - split: "preview"
     path: "preview/mos_phase_preview.parquet"
+- config_name: ego_preview
+  description: "Data Studio media table with one video-layout RGB/mask image preview per egocentric (GoPro) scene."
+  data_files:
+  - split: "preview"
+    path: "preview/ego_preview_v2.parquet"
 - config_name: single_object
   description: "SOS selected-object catalog; one 360 collection per object, no difficulty split."
   data_files:

preview/ego_preview_v2.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:616ff9b55d46d1d33c9ea9c91abf7619e2fb544bcc54b663fbe28786321230a9
+size 13044293