Add governed DHMV terrain analysis

docs/CODEX_EXECUTION_LOG.md

@@ -8684,3 +8684,36 @@ Next:
 - Implement P4 Digitaal Hoogtemodel Vlaanderen with a governed DTM/DSM product,
   vertical reference, bounded raster storage and measured elevation/slope
   statistics. Do not infer water depth or volume from terrain height alone.
+
+## Sprint 207 - Governed DHMV II terrain foundation (2026-07-15)
+
+Implemented:
+- Added a fixed `dtm_1m`/`dsm_1m` product registry for the official Digitaal
+  Vlaanderen production WCS and rejected arbitrary coverage identifiers.
+- Added bounded WCS scaling, multipart GeoTIFF extraction, exact persisted-Area
+  clipping and validation of EPSG:31370, one Float32 band, resolution, nodata
+  and valid cells before canonical DatasetService persistence.
+- Retained response, coverage and normalized-output SHA256 evidence plus native
+  1 m resolution, default 5 m analysis resolution, TAW and period 2013-2015.
+- Added exact masked terrain selection with governed height, relief and slope
+  metrics. DTM and DSM semantics remain separate; water depth/volume remain
+  explicit unsupported metrics and drainage is not calculated.
+- Added the `Hoogte & reliëf` map theme, MapLibre colour-relief overlay,
+  readable period/source labels and raster-aware rectangle/full-Area queries.
+- Added `scripts/provision_mol_dhmv.py`, Docker/Unraid settings and documentation.
+
+Initial validation:
+- Focused acquisition, raster, GIS metric, API, frontend and packaging tests
+  pass with deterministic synthetic GeoTIFF fixtures.
+- No migration, direct raster database write, LiDAR point-cloud processing or
+  water-volume inference was introduced.
+
+Known limitations:
+- DHMV II represents acquisition period 2013-2015 and is not a current or
+  annual height series. Exact flight-day contours are not yet joined.
+- The 5 m analysis copy is operationally bounded; sub-5 m detail requires an
+  explicit smaller acquisition. DSM-DTM building height remains future work.
+
+Next:
+- Complete the full readiness and live Mol operator/browser validation, then
+  audit P5 bathymetry sources before enabling any water depth or volume metric.