feat: add temporal Mol explorer

docs/DATA_SOURCES.md

@@ -29,6 +29,32 @@ start geen verborgen providerfetch. De resulterende GeoJSON-artefacten,
 checksums en bron-URL's worden onder persistent operator storage bewaard en
 via de bestaande DatasetService/vectorfeature-flow geïmporteerd.
 
+### Mol population history
+
+`scripts/provision_mol_population_history.py` imports official Statbel
+population-by-statistical-sector tables and matching sector geometries for
+2021 through 2025. It keeps the published sector total as
+`population_total`, clips the official geometry to Mol NIS `13025` and uploads
+each year as a separate dataset in
+`statbel:population-statistical-sector:mol`.
+
+Complete sectors use their published population total. A rectangle that cuts
+through a sector uses an explicitly labelled area-weighted estimate; the
+source does not justify a more precise intra-sector distribution.
+
+### Mol historical land use
+
+`scripts/provision_mol_historical_landuse.py` uses the official Digitaal
+Vlaanderen Historical Land Use WFS for the 1778, 1873 and 1969 collections.
+Buildings, forest, water and roads are filtered server-side, clipped to the
+official Mol boundary and uploaded through the existing dataset service.
+Source classes, request URLs, observation year, simplification tolerance and
+methodological limitations remain in provenance.
+
+These historical map editions support exploratory area evolution, not
+cadastral object lineage. Their feature identities are declared unstable and
+GeoIntel does not fabricate added/removed object counts.
+
 ## OSM
 
 - Naam: OpenStreetMap