Complete regional history live validation

CHANGELOG.md

@@ -19,6 +19,19 @@
   feature limits and one canonical regional Dataset upload per theme/year.
 - Extended the regional time-series coordinator and release packaging without
   changing API contracts, database migrations or frontend architecture.
+- Provisioned all nine snapshots on live Tower/PostGIS: 207,717 persisted
+  polygon features across three complete 28-municipality temporal series.
+  Every Dataset is ready, has one immutable DatasetVersion and was reused by
+  the idempotency run without duplicate persistence.
+- Added the exact-area fast path for these already-clipped regional artifacts,
+  reducing complete-Kempen comparisons from minutes to 0.9-4.1 seconds in the
+  live audit while preserving the calculated values.
+- Suppressed inapplicable generic line metrics for historical polygon classes;
+  results now show governed hectares plus object counts, never artificial
+  `0 km` road/watercourse measurements.
+- Kept the top workbench source context synchronized with the selected
+  Evolution series. Browser verification covered complete Kempen, Mol and a
+  3440 x 1440 viewport with no console warnings or errors.
 
 ## Sprint 208 Governed VMM flood-hazard scenarios (2026-07-15)