Rename media batches to brgm-v1 and brgm-v2

README.md

@@ -13,9 +13,9 @@ the application repository and submitted through pull requests.
 
 ## Contents
 
-- `media/figures/brgm/`: 6,046 BRGM worklist figures.
-- `media/figures/dataset2/`: all 1,512 dataset-2 figures, of which 156 had legacy
-  annotations at migration time.
+- `media/figures/brgm-v1/`: 1,512 figures from the earlier BRGM parsing batch,
+  of which 156 had legacy annotations at migration time.
+- `media/figures/brgm-v2/`: 6,046 figures from the newer BRGM parsing batch.
 - `figures.jsonl`: portable figure manifest with dimensions, content SHA-256, source
   document, relative media path, and MapPool prediction metadata.
 - `mappool_predictions.csv`: portable map/not-map labels and decision margins.