Avoid false garbage classification for UPD mentions

tests/test_classify.py

@@ -36,6 +36,13 @@ class TestGarbageHeader:
     def test_not_garbage(self):
         assert _is_garbage_by_header("ДОГОВОР № 03700_1 об оказании услуг") is False
 
+    def test_upd_mention_in_contract_is_not_garbage(self):
+        text = "Договор № 03700. Оплата производится на основании УПД и счета."
+        assert _is_garbage_by_header(text) is False
+
+    def test_upd_document_header_is_garbage(self):
+        assert _is_garbage_by_header("УПД № 123 от 01.01.2026") is True
+
 
 class TestSafeJsonParse:
     def test_valid(self):