docs: document 16 excluded non-Google models (OpenRobotics/LeDSantos)

README.md

@@ -92,6 +92,24 @@ mesh stats (`vertices`, `faces`, `is_watertight`, `surface_area_normalized`,
 `warnings` are recorded in `json["glb_processing"]` and aggregated in
 [`stats/processing_log.jsonl`](./stats/processing_log.jsonl).
 
+## Excluded objects
+
+This dataset contains only the **1,030 objects authored by Google** (Fuel owner
+`GoogleResearch`) in the "Scanned Objects by Google Research" collection. That
+Fuel collection's listing also includes 16 models owned by other authors; they
+are **intentionally excluded** because they are not Google scans, use a
+different file structure (`.dae`/`.obj`, optional textures, 2-6 thumbnails), and
+carry different licenses (CC-BY-4.0 and CC0-1.0):
+
+- `OpenRobotics` (13): Bed, Cardboard box, Door handle, Fridge, Hinged door,
+  KitchenCountertop, LampAndStand, Plastic Cup, Shower, SquareShelf,
+  Standard Toilet, Vanity, WhiteCabinet
+- `LeDSantos` (3): ada_lovelace_poster, garage_door, toilet_paper
+
+These appear as `status: "failed"` rows in
+[`stats/processing_log.jsonl`](./stats/processing_log.jsonl) (the raw downloader
+requested them under the wrong owner, yielding invalid archives).
+
 ## License & attribution
 
 This dataset is a repackaging of the Google Scanned Objects dataset by Google LLC,