feat: author resource-aware riverbank grove

docs/RESOURCE_NODE_MIGRATION.md

@@ -567,6 +567,16 @@ existing `ResourceStateRecord`. The reviewed 18/180/1,800-source benchmark and
 exact-selection contract live in
 [Loaded Resource Discovery 01](benchmarks/LOADED_RESOURCE_DISCOVERY_01.md).
 
+The first authored placement proof now nests `berry_bush_river_02` and
+`tree_river_resource_01` inside one riverbank cluster without changing their
+IDs, metadata, or the eighteen-resource save contract. Twenty-eight decorative
+understory instances and two silhouette trees remain presentation-only. The
+finite anchors have resource-specific visuals and separate terrain-snapped
+approach points; recursive navigation checks cover both, while a forced query
+selects the farther berry only after expanding beyond the first 24 m range.
+The matched review lives in
+[Jajce Resource Grove 04](baselines/JAJCE_RESOURCE_GROVE_04.md).
+
 ## Test scenarios
 
 At minimum, exercise: