feat(trading): support multi-item purchase intents

tests/test_verify.py

@@ -134,6 +134,54 @@ async def test_match_ignores_query_string_difference():
     assert result.verdict == verify.VerifyVerdict.ALREADY_ORDERED
 
 
+async def test_multiple_item_intent_requires_all_items_in_same_order():
+    gateway = FakeGateway()
+    site = FakeSite(
+        window=OrderListWindow(
+            entries=[
+                OrderListEntry(
+                    order_number="o1",
+                    order_date="2026-08-10T00:00:00Z",
+                    items=[
+                        OrderListItem(item_url="https://item.rakuten.co.jp/shop/x/"),
+                        OrderListItem(item_url="https://item.rakuten.co.jp/shop/y/"),
+                    ],
+                )
+            ],
+            window_fully_covered=True,
+        )
+    )
+    task = _make_task()
+    task.intent = {
+        "items": [
+            {"item_url": "https://item.rakuten.co.jp/shop/x/"},
+            {"item_url": "https://item.rakuten.co.jp/shop/y/"},
+        ]
+    }
+    result = await verify.verify_on_site(task, gateway=gateway, site=site)
+    assert result.verdict == verify.VerifyVerdict.ALREADY_ORDERED
+    assert result.site_order_id == "o1"
+
+
+async def test_multiple_item_intent_partial_order_match_is_not_ordered():
+    gateway = FakeGateway()
+    site = FakeSite(
+        window=OrderListWindow(
+            entries=[_entry("o1", "https://item.rakuten.co.jp/shop/x/")],
+            window_fully_covered=True,
+        )
+    )
+    task = _make_task()
+    task.intent = {
+        "items": [
+            {"item_url": "https://item.rakuten.co.jp/shop/x/"},
+            {"item_url": "https://item.rakuten.co.jp/shop/y/"},
+        ]
+    }
+    result = await verify.verify_on_site(task, gateway=gateway, site=site)
+    assert result.verdict == verify.VerifyVerdict.NOT_ORDERED
+
+
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