DEVX-91: refactor: add find_task_by_identifier, config fallbacks for tools

tests/unit/test_create_pr.py

@@ -56,7 +56,7 @@ class TestGetVikunjaTaskTitle:
     @patch.dict("os.environ", {"VIKUNJA_TOKEN": "tok"})
     def test_found(self, mock_client_cls: MagicMock) -> None:
         mock_client = MagicMock()
-        mock_client.list_project_tasks.return_value = [{"identifier": "DEVX-42", "title": "Add feature"}]
+        mock_client.find_task_by_identifier.return_value = {"identifier": "DEVX-42", "title": "Add feature"}
         mock_client_cls.return_value = mock_client
         assert get_vikunja_task_title("DEVX-42") == "Add feature"
 
@@ -69,20 +69,7 @@ class TestGetVikunjaTaskTitle:
     @patch.dict("os.environ", {"VIKUNJA_TOKEN": "tok"})
     def test_not_found(self, mock_client_cls: MagicMock) -> None:
         mock_client = MagicMock()
-        mock_client.list_project_tasks.return_value = []
-        mock_client_cls.return_value = mock_client
-        with pytest.raises(click.ClickException, match="Could not find"):
-            get_vikunja_task_title("DEVX-42")
-
-    @patch("devx.tools.create_pr.VikunjaClient")
-    @patch.dict("os.environ", {"VIKUNJA_TOKEN": "tok"})
-    def test_pagination_not_found(self, mock_client_cls: MagicMock) -> None:
-        from devx.config import DEFAULT_PER_PAGE
-
-        mock_client = MagicMock()
-        page1 = [{"identifier": f"OTHER-{i}"} for i in range(DEFAULT_PER_PAGE)]
-        page2 = [{"identifier": "OTHER-99"}]
-        mock_client.list_project_tasks.side_effect = [page1, page2]
+        mock_client.find_task_by_identifier.return_value = None
         mock_client_cls.return_value = mock_client
         with pytest.raises(click.ClickException, match="Could not find"):
             get_vikunja_task_title("DEVX-42")