Ground location occurrences with contextual selectors

assets/dnd/location-occurrences/schemas/dnd_location_occurrences_llm.v1.json

@@ -10,10 +10,21 @@
       "items": {
         "type": "object",
         "additionalProperties": false,
-        "required": ["location_id", "name", "kind", "source_refs"],
+        "required": ["name", "registry_refs", "kind", "source_refs"],
         "properties": {
-          "location_id": {"type": "string"},
           "name": {"type": "string"},
+          "registry_refs": {
+            "type": "array",
+            "items": {
+              "type": "object",
+              "additionalProperties": false,
+              "required": ["start_unit_id", "end_unit_id"],
+              "properties": {
+                "start_unit_id": {"type": "integer", "minimum": 1},
+                "end_unit_id": {"type": "integer", "minimum": 1}
+              }
+            }
+          },
           "kind": {"enum": ["visited", "planned", "recalled", "mentioned"]},
           "source_refs": {
             "type": "array",