fix: 已出号后新一轮询价不带上一单字段

点名海运时丢掉旧陆运补问草稿，避免补字段误发填写样例图。

Co-authored-by: Cursor <cursoragent@cursor.com>

inquiry-agent/tests/test_land_dispatch.py

@@ -25,7 +25,7 @@ from agent.channel.wecom.models import InboundMessage
 from agent.handlers.text_inquiry import handle_text_inquiry
 from agent.policy.air_text_flow import reset_air_text_flow_for_test
 from agent.policy.land_text_flow import get_land_text_flow, reset_land_text_flow_for_test
-from agent.policy.sea_text_flow import reset_sea_text_flow_for_test
+from agent.policy.sea_text_flow import get_sea_text_flow, reset_sea_text_flow_for_test
 from agent.routing.decision import RouteDecision
 from agent.routing.dispatch import dispatch_inbound
 from tests.test_sea_text_inquiry import COMPLETE_SEA
@@ -323,6 +323,55 @@ class LandDispatchTests(unittest.TestCase):
         self.assertNotIn("你好，我是询价机器人", last)
         self.assertIn("请说明要调哪一项费用", last)
 
+    def test_sea_field_supplement_not_stolen_by_stale_land(self) -> None:
+        """
+        旧陆运选项草稿不能抢走海运补问。
+
+        测服：先陆运缺选项，再发海运缺贸易条款/运输分类，下一句只补这两项，
+        不能回陆运「参数提取不全」或填写样例图。
+        """
+        store = get_message_store()
+        handle_text_inquiry(
+            InboundMessage(sender_id="mix-sea", message_id="m-land-old", content="陆运询价"),
+            injected_facts={"起运港": "广州", "目的港": "深圳", "品名": "衣服"},
+            injected_mode="LAND",
+            store=store,
+        )
+        self.assertEqual(get_land_text_flow().session_of("mix-sea").phase, "need_land_options")
+        incomplete = {
+            "起运港": "上海",
+            "目的港": "洛杉矶",
+            "品名": "普货",
+            "货量": "20吨",
+            "整柜或拼柜": "整柜",
+            "箱型箱量": "1x40HQ",
+        }
+        phase = handle_text_inquiry(
+            InboundMessage(sender_id="mix-sea", message_id="m-sea-ask", content="海运询价"),
+            injected_facts=incomplete,
+            injected_mode="SEA",
+            store=store,
+        )
+        self.assertEqual(phase, "clarify")
+        self.assertEqual(get_sea_text_flow().session_of("mix-sea").phase, "clarify")
+        self.assertIsNone(get_land_text_flow().session_of("mix-sea"))
+        before = len(store._outbox)
+        phase = handle_text_inquiry(
+            InboundMessage(
+                sender_id="mix-sea",
+                message_id="m-sea-fill",
+                content="贸易条款：FOB 运输分类：其他",
+            ),
+            injected_facts={"贸易条款": "FOB", "运输分类": "其他"},
+            store=store,
+        )
+        self.assertNotEqual(phase, "need_land_options")
+        self.assertEqual(get_sea_text_flow().session_of("mix-sea").business_line, "SEA")
+        added = "\n".join(i.content for i in list(store._outbox.values())[before:])
+        self.assertNotIn("参数提取不全", added)
+        self.assertNotIn("填写样例", added)
+        self.assertNotIn("运输类型", added)
+
     def test_clarify_short_reply_misrouted_as_other_stays_on_inquiry(self) -> None:
         """补问阶段回「111」即使被标闲聊，也不能发开场白。"""
         store = get_message_store()