fix(pipeline): premature state update + reject 재생성 알림

버그1: /feedback approve가 bg task 시작 전에 state를 next_pending으로 set →
polling이 빈 video_url로 알림 발송. bg task의 run_step이 state를 set하도록
일임 — 이중 update 제거.

버그2: reject 후 같은 *_pending 상태로 재생성됐을 때 dedupe에 막혀 알림이
안 감. dedupe 키에 feedback_count_per_step[step]을 포함 — 재생성마다
count가 증가하므로 키가 달라져 재알림 동작.

agent-office/tests/test_pipeline_polling.py

@@ -35,6 +35,7 @@ async def test_poll_notifies_once_per_state():
         "state": "cover_pending",
         "cover_url": "/x.jpg",
         "track_title": "Test",
+        "feedback_count_per_step": {},
     }]
     with patch(
         "app.agents.youtube_publisher.service_proxy.list_active_pipelines",
@@ -52,6 +53,27 @@ async def test_poll_notifies_once_per_state():
         assert mock_send.call_count == 1
 
 
+@pytest.mark.asyncio
+async def test_poll_renotifies_on_reject_regen(monkeypatch):
+    from app.agents.youtube_publisher import YoutubePublisherAgent
+
+    pipelines_v1 = [{"id": 1, "state": "cover_pending", "cover_url": "/x.jpg",
+                      "track_title": "Test", "feedback_count_per_step": {}}]
+    pipelines_v2 = [{"id": 1, "state": "cover_pending", "cover_url": "/x2.jpg",
+                      "track_title": "Test", "feedback_count_per_step": {"cover": 1}}]
+    list_mock = AsyncMock(side_effect=[pipelines_v1, pipelines_v2])
+    with patch("app.agents.youtube_publisher.service_proxy.list_active_pipelines", list_mock), \
+         patch("app.agents.youtube_publisher.send_raw",
+                new=AsyncMock(return_value={"ok": True, "message_id": 99})), \
+         patch("app.agents.youtube_publisher.service_proxy.save_pipeline_telegram_msg",
+                new=AsyncMock()):
+        a = YoutubePublisherAgent()
+        await a.poll_state_changes()  # 1st: notify
+        await a.poll_state_changes()  # 2nd: feedback count differs → notify again
+        from app.agents.youtube_publisher import send_raw as sr
+        assert sr.call_count == 2
+
+
 @pytest.mark.asyncio
 async def test_on_telegram_reply_approve_calls_feedback():
     from app.agents.youtube_publisher import YoutubePublisherAgent