Add Krea2 atlas gap plans

docs/krea2-pov-pose-atlas.md

@@ -25,7 +25,8 @@ and generator decision behind that variant.
 
 For command-line planning, `python tools/krea2_tuning_report.py` shows which
 catalog variants are proven or pending and which atlas pose folders are still
-unmapped by the catalog.
+unmapped by the catalog. Unmapped folders include sample pose/control image
+paths and a suggested candidate key to start the next catalog entry.
 
 ## Inventory