feat: add source-grounded evolution and Ollama assistant

docs/DATA_SOURCES.md

@@ -151,8 +151,15 @@ GET query, which the public gateway rejects.
 `scripts/provision_official_landuse_timeseries.py` uses the public Departement
 Omgeving/MercatorNet WCS to retrieve the harmonized version 3 land-use maps for
 2013, 2016, 2019, 2022 and 2025. The source is a categorical 10 m GeoTIFF in
-Belgian Lambert 72 (`EPSG:31370`) with 19 documented classes. GeoIntel currently
-derives only class `12` (`Bos`) as the operational forest theme.
+Belgian Lambert 72 (`EPSG:31370`) with 19 documented classes. GeoIntel derives
+four explicitly labelled, methodologically comparable surfaces from one
+retained source raster per year:
+
+- `forest`: class 12, bosoppervlakte;
+- `water`: class 17, wateroppervlakte (not water volume);
+- `built`: classes 1-4 and 6-8, surface used by built functions, not GRB
+  building footprints;
+- `transport`: class 5, transport-infrastructure surface, not GRB road length.
 
 Every source raster is clipped against the explicit official boundary,
 validated for integer classes, CRS and resolution, checksummed and retained in
@@ -180,7 +187,7 @@ modern forest operators to the approved 28-municipality
 boundary and writes to `Kempen Regional Workbench` through the normal dataset
 API. Regional keys are
 `statbel:population-statistical-sector:kempen-transport-region` and
-`department-omgeving:land-use:forest:kempen-transport-region`, so Mol datasets
+`department-omgeving:land-use:{theme}:kempen-transport-region`, so Mol datasets
 remain independent observations rather than aliases.
 
 The command is explicit and operator-triggered. No source fetch happens during
@@ -201,6 +208,31 @@ Official catalogues:
 - https://www.vlaanderen.be/datavindplaats/catalogus/landgebruik-vlaanderen-toestand-2025
 - https://www.vlaanderen.be/statistiek-vlaanderen/ruimtegebruik/landgebruik/metadata-landgebruik
 
+## Audited official follow-up sources
+
+These sources are available from their public authorities but are not silently
+treated as loaded GeoIntel data. The Source inventory labels them separately
+until a governed operator import, provenance record and validation pass exist.
+
+- Historical orthophotos (Digitaal Vlaanderen): 1971 and 1979-1990 through
+  the `OKZ` WMS, with additional dated mosaics as separate products. Suitable
+  for visual/image evolution after a bounded acquisition contract is added.
+- Biologische Waarderingskaart / Natura 2000 (INBO), state 2025: suitable for
+  habitat, biotope and ecological-value analysis, not a continuous annual
+  series.
+- Agricultural-use parcels (Agentschap Landbouw en Zeevisserij): annual files
+  suitable for crop and agricultural-surface evolution after schema/version
+  harmonization.
+- Buildings and Addresses Register (Digitaal Vlaanderen): continuously updated
+  building status, life cycle and address linkage; complementary to GRB
+  geometry and not yet imported.
+- DHMV II DTM/DSM (Digitaal Vlaanderen): 1 m/5 m elevation based on 2013-2015
+  LiDAR, suitable for elevation, slope and drainage. It does not provide water
+  depth.
+- Waterinfo/VMM: station time series for water level, flow and precipitation.
+  These can describe hydrological state, but do not provide area-wide water
+  volume without a compatible bottom profile/bathymetry model.
+
 ## OSM
 
 - Naam: OpenStreetMap