restore: import verified wave3 baseline

fixtures/story-nodes/presentation-snapshot.json

@@ -0,0 +1,56 @@
+{
+  "id": "node_002",
+  "story_id": "story_nana_demo",
+  "branch_id": "branch_main",
+  "parent_id": "node_001",
+  "action_id": "action_promise",
+  "user_input": "我答应你，天亮前一定回来。",
+  "scene": {
+    "id": "old_station_platform_rain",
+    "title": "雨夜的旧青川站"
+  },
+  "character": {
+    "id": "nana",
+    "name": "娜娜",
+    "expression": "relieved",
+    "pose": "lowered_hands"
+  },
+  "beats": [
+    {
+      "id": "beat_action_promise",
+      "kind": "action",
+      "speaker": null,
+      "text": "你认真地向她作出承诺。",
+      "visual": null
+    },
+    {
+      "id": "beat_nana_accepts",
+      "kind": "dialogue",
+      "speaker": "娜娜",
+      "text": "好。我等你到天亮。",
+      "visual": {
+        "character": "nana",
+        "expression": "relieved",
+        "pose": "lowered_hands",
+        "scene": null
+      }
+    }
+  ],
+  "suggestions": [
+    {
+      "id": "suggestion_ask_clock",
+      "label": "询问站钟",
+      "draft": "那座停摆的站钟，和你等的人有关吗？"
+    },
+    {
+      "id": "suggestion_leave",
+      "label": "准备离开",
+      "draft": "我最后看了一眼站台，准备动身。"
+    }
+  ],
+  "can_continue": true,
+  "delta": {
+    "ops": []
+  },
+  "state_hash": "sha256:fixture"
+}