feat: complete governed Walloon coverage sources

CHANGELOG.md

@@ -9,6 +9,20 @@
 
 ## Unreleased - Post-V1 capability completion (2026-07-19)
 
+- Added operational Walloon WALOUS 2020/2023 land-cover analysis: an
+  allowlisted checksum-validating provisioner, bounded EPSG:3812 window
+  persistence, semantic hectare metrics, governed map rendering and raster
+  temporal comparison. The map acquires comparable configured editions for
+  the same selection so 2020-2023 evolution becomes available without manual
+  dataset administration.
+- Added the current legal SPW Walloon flood-hazard polygons as a bounded
+  authoritative vector product with class-aware hectare metrics and canonical
+  persistence. No WMS pixels or modeled depths are fabricated.
+- Kept the Walloon DTM and MDK North Sea depth model honest: the published DTM
+  artifacts require an explicit large-storage partition plan, while the MDK
+  endpoint still fails strict hostname validation. Neither is presented as a
+  measured analytical layer.
+
 - Made `Belgium and North Sea Workbench` the unconditional frontend startup
   context, moved the initial MapLibre viewport to national extent and removed
   Mol/Kempen defaults from project/area forms and end-user source copy. Mol and