fix: align WALOUS with official class codes

docs/API_CONTRACTS.md

@@ -494,10 +494,12 @@ becomes true only when the checksum-validated source GeoTIFF exists below
 
 Reads a bounded window from one provisioned official 1 m WALOUS source,
 applies nearest-neighbour resampling to the configured analysis resolution,
-masks `bbox intersect Area`, validates class values 1-11 and persists a normal
-raster Dataset through `DatasetService`. URLs, paths, classes and resolutions
-are not caller-controlled. Equal spatial requests for 2020 and 2023 share one
-temporal series key.
+masks `bbox intersect Area`, validates the official non-contiguous class-code
+set `1, 2, 3, 4, 5, 6, 7, 8, 9, 80, 90` and persists a normal raster Dataset
+through `DatasetService`. URLs, paths, classes and resolutions are not
+caller-controlled. Equal spatial requests for 2020 and 2023 share one temporal
+series key. The exact official observation ranges are retained as
+2020-04-01/2020-04-24 and 2023-05-27/2023-06-25.
 
 ### POST `/api/v1/projects/{project_id}/datasets/{dataset_id}/raster/walous/select`
 

docs/CODEX_EXECUTION_LOG.md

@@ -3654,6 +3654,12 @@ Validation:
 
 ## Post-V1 national coverage completion: Wallonia (2026-07-22)
 
+- Live Tower provisioning exposed an incorrect assumption that 11 WALOUS
+  classes implied numeric codes 1 through 11. The official SPW legend and the
+  downloaded 2020 raster confirm codes `1,2,3,4,5,6,7,8,9,80,90`. Corrected
+  validation, class semantics, colours and all hectare aggregations; added a
+  provisioner regression containing codes 80/90 and retained exact source
+  observation ranges.
 - Validated the official WALOUS 2020 and 2023 archives, their EPSG:3812 1 m
   raster contract, 11 classes, CC BY 4.0 attribution and published edition
   accuracy. Added a fail-closed operator provisioner with archive-size,

docs/DATA_SOURCES.md

@@ -790,6 +790,27 @@ Areas. They persist only through `DatasetService`; the browser never contacts
 either provider directly. Cross-zone selections remain split by authority and
 metric semantics.
 
+## Wallonia WALOUS land cover
+
+The official SPW `WAL_OCS_IA__2020` and `WAL_OCS_IA__2023` GeoTIFF archives
+provide comparable Walloon land-cover observations at native 1 m resolution in
+EPSG:3812. Runtime analysis reads only bounded windows from operator-
+provisioned, checksum-recorded source files and uses nearest-neighbour
+resampling for the governed 10 m analysis derivative.
+
+The 11 semantic classes use the non-contiguous source codes `1, 2, 3, 4, 5, 6,
+7, 8, 9, 80, 90`. In order these mean artificial ground, above-ground
+construction, railway, bare soil, surface water, rotating herbaceous cover,
+continuous herbaceous cover, conifer trees above 3 m, deciduous trees above 3
+m, conifer woody cover up to 3 m and deciduous woody cover up to 3 m. Codes 80
+and 90 must never be normalized to invented classes 10 and 11.
+
+The official temporal extents are 2020-04-01 through 2020-04-24 and 2023-05-27
+through 2023-06-25. Metrics are estimated hectares from classified cells. They
+are not legal land use, ownership, individual tree counts, timber volume or
+water volume. The official catalogue reports overall accuracy per edition and
+also warns that accuracy varies by class and place.
+
 ## Bathymetry, inland profiles and maritime scope
 
 The official VHA Digital Atlas profile-point layer is the first operational

docs/DATA_SPECIFICATION.md

@@ -308,6 +308,15 @@ review hashes, persists sampled official flight dates as the temporal evidence
 range and creates a new Dataset/DatasetVersion through DatasetService. It does
 not retroactively rewrite or delete legacy rows.
 
+WALOUS land-cover rasters retain EPSG:3812, their native 1 m source resolution,
+the derived analysis resolution, source checksum and exact observation range.
+The governed class domain is `{1,2,3,4,5,6,7,8,9,80,90}`. Codes 80 and 90 are
+valid official low-woody-cover classes; `10` and `11` are not substitutes.
+Bounded derivatives use `uint8`, nodata 255 and nearest-neighbour resampling.
+Area metrics group forest/tree cover as `{8,9,80,90}`, water as `{5}`,
+artificial cover as `{1,2,3}`, rotating herbaceous cover as `{6}`, continuous
+herbaceous cover as `{7}` and bare soil as `{4}`.
+
 ### Hydrological station observations
 
 Waterinfo observations are persisted as EPSG:4326 Point features, one station