Move item occurrences to canonical namespace

internal/modules/integration/dnd_itemoccurrences_runner_test.go

@@ -30,9 +30,9 @@ pipelines:
               lane: registry
         artifacts:
           occurrences:
-            extract: dnd/item-events
+            extract: dnd/item-occurrences
             merge: appendorder
-            normalize: dnd/item-events
+            normalize: dnd/item-occurrences
 `)
 	if err != nil {
 		t.Fatal(err)
@@ -51,7 +51,7 @@ pipelines:
       - id: record-occurrences
         artifacts:
           occurrences:
-            extract: dnd/item-events
+            extract: dnd/item-occurrences
 `, "record-occurrences", "record-occurrences", 1))
 	if err != nil {
 		t.Fatal(err)

internal/modules/integration/testdata/seriatim_item_occurrences_session.json

@@ -1,7 +1,7 @@
 {
   "metadata": {
-    "id": "item-events-session",
-    "title": "Synthetic D&D item-event session"
+    "id": "item-occurrences-session",
+    "title": "Synthetic D&D item-occurrence session"
   },
   "segments": [
     {"id": 1, "start": 0, "end": 4, "speaker": "DM", "text": "An ancient coin rests in the chest."},