fix: align WALOUS with official class codes

scripts/provision_walous_sources.py

@@ -33,6 +33,7 @@ SOURCES = {
 }
 MAX_ARCHIVE_BYTES = 1_000_000_000
 MAX_EXTRACTED_BYTES = 50_000_000_000
+WALOUS_CLASS_CODES = {1, 2, 3, 4, 5, 6, 7, 8, 9, 80, 90}
 
 
 def sha256_file(path: Path) -> str:
@@ -110,9 +111,9 @@ def validate_raster(path: Path) -> dict:
         sample_width = min(2048, source.width)
         sample = source.read(1, out_shape=(sample_height, sample_width), masked=True, resampling=Resampling.nearest)
         values = np.unique(sample.compressed()).astype(int).tolist()
-        unexpected = sorted(set(values) - set(range(1, 12)))
+        unexpected = sorted(set(values) - WALOUS_CLASS_CODES)
         if unexpected:
-            raise RuntimeError(f"WALOUS sample contains classes outside 1-11: {unexpected}")
+            raise RuntimeError(f"WALOUS sample contains classes outside the official 11-class code set: {unexpected}")
         return {
             "path": str(path),
             "crs": str(source.crs),