Add governed SPW bathymetry analysis

CHANGELOG.md

@@ -7,6 +7,29 @@
 
 # Changelog
 
+## National history and governed SPW bathymetry (2026-07-19)
+
+- Accepted the two documented official Statbel geometry-archive variants:
+  internal member names with or without the repeated `31370` token and
+  situation dates in ISO or `YYYY/MM/DD` notation. CRS, release-year, schema,
+  join, topology, total and checksum validation remain fail-closed.
+- Prepared the official Statbel 2021-2024 national snapshots so the existing
+  2025 Belgium population layer can become one consistent five-edition
+  evolution series.
+- Added a pinned SPW bathymetry operator for the official 2023-05-23
+  0.5-m GeoTIFF release. It validates SHA-256, archive safety, EPSG:3812,
+  Float32, nodata and value bounds, reads through `/vsizip/`, creates only a
+  bounded COG and persists through the canonical Dataset API.
+- Added persisted SPW bathymetry selection and PNG routes, with waterbed-height
+  percentiles in mDNG, surveyed hectares and coverage. Current water depth,
+  volume and vertical-datum conversion remain explicitly unsupported.
+- Integrated ready SPW rasters into the Waterbodem map theme, MapLibre image
+  overlay, rectangle analysis and source portfolio while excluding analytical
+  bathymetry rasters from detection imagery.
+- Kept MDK North Sea acquisition blocked behind strict TLS and official
+  low-resolution data-request prerequisites; no certificate bypass or
+  synthesized North Sea depth was introduced.
+
 ## Post-RC Belgium data federation (2026-07-19)
 
 - Made persisted NGI administrative, RBINS marine reporting and Belgian