Add UI delivery presenters and event DTOs

docs/backlog/01_execution_backlog.md

@@ -45,11 +45,11 @@
 ## Package E: Delivery
 
 - [x] typed worker registration schema
-- [ ] task event DTO normalization
+- [x] task event DTO normalization
 - [ ] confirmation cards
-- [ ] progress cards
+- [x] progress cards
 - [ ] artifact cards
-- [ ] error cards
+- [x] error cards
 
 ## Package F: Validation
 

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"
+    }
+  }
 }
 ```
 

docs/ui/USER_INTERFACE.md

@@ -309,6 +309,20 @@ syntax_check: success
 }
 ```
 
+## Backend Status
+
+Сейчас backend уже формирует:
+
+- `plan_card`
+- `progress_card`
+- `error_card`
+- normalized task event DTO with optional card references
+
+Следующие карточки остаются следующими шагами:
+
+- `confirmation_card`
+- `artifact_card`
+
 ## Принцип
 
 Пользователь должен всегда понимать: