Complete Belgian building corpus v2 workflow

backend/tests/test_belgium_training_portfolio.py

@@ -19,7 +19,7 @@ def test_portfolio_covers_every_region_split_and_context_family() -> None:
     assert len({aoi.slug for aoi in module.AOIS}) == len(module.AOIS)
     counts = Counter((aoi.region, aoi.split) for aoi in module.AOIS)
     for region in module.REGION_CONTRACT:
-        assert counts[(region, "train")] >= 4
+        assert counts[(region, "train")] >= 6
         assert counts[(region, "val")] >= 2
         assert counts[(region, "calibration")] >= 2
         assert counts[(region, "test")] >= 2