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

tests/unit/test_api_clients.py

@@ -781,6 +781,42 @@ class TestVikunjaClient:
         call_kwargs = client._session.request.call_args.kwargs
         assert call_kwargs["json"]["description"] == ""
 
+    def test_find_task_by_identifier_found(self) -> None:
+        client = VikunjaClient("https://work.example.com", "tok")
+        client._session.request = MagicMock(
+            return_value=_mock_response([{"identifier": "DEVX-1"}, {"identifier": "DEVX-42", "title": "Found"}])
+        )
+        result = client.find_task_by_identifier(6, "DEVX-42", per_page=50)
+        assert result is not None
+        assert result["title"] == "Found"
+
+    def test_find_task_by_identifier_not_found(self) -> None:
+        client = VikunjaClient("https://work.example.com", "tok")
+        client._session.request = MagicMock(
+            return_value=_mock_response([{"identifier": "DEVX-1"}, {"identifier": "DEVX-2"}])
+        )
+        result = client.find_task_by_identifier(6, "DEVX-99", per_page=50)
+        assert result is None
+
+    def test_find_task_by_identifier_empty_project(self) -> None:
+        client = VikunjaClient("https://work.example.com", "tok")
+        client._session.request = MagicMock(return_value=_mock_response([]))
+        result = client.find_task_by_identifier(6, "DEVX-1", per_page=50)
+        assert result is None
+
+    def test_find_task_by_identifier_paginates(self) -> None:
+        client = VikunjaClient("https://work.example.com", "tok")
+        full_page = [{"identifier": f"DEVX-{i}"} for i in range(50)]
+        client._session.request = MagicMock(
+            side_effect=[
+                _mock_response(full_page),
+                _mock_response([{"identifier": "DEVX-50", "title": "Found on page 2"}]),
+            ]
+        )
+        result = client.find_task_by_identifier(6, "DEVX-50", per_page=50)
+        assert result is not None
+        assert result["title"] == "Found on page 2"
+
 
 class TestIsRetryable:
     def test_connection_error_is_retryable(self) -> None: