Add UI delivery presenters and event DTOs

docs/contracts/API_CONTRACTS.md

@@ -26,7 +26,14 @@
   "task_id": "task_1",
   "response_type": "answer | task_started | confirmation_required | error",
   "message": "string",
-  "cards": []
+  "cards": [
+    {
+      "type": "plan_card"
+    },
+    {
+      "type": "progress_card"
+    }
+  ]
 }
 ```
 
@@ -53,7 +60,8 @@
   "progress": {
     "completed": 2,
     "total": 5
-  }
+  },
+  "cards": []
 }
 ```
 
@@ -66,9 +74,18 @@ WebSocket может быть добавлен как secondary adapter, но co
 ```json
 {
   "event": "node_started",
-  "task_id": "task_1",
-  "node_id": "node_3",
-  "timestamp": "..."
+  "data": {
+    "event_id": "evt_1",
+    "event_type": "node_started",
+    "task_id": "task_1",
+    "node_id": "node_3",
+    "timestamp": "...",
+    "payload": {},
+    "card": {
+      "type": "progress_card_ref",
+      "task_id": "task_1"
+    }
+  }
 }
 ```