refactor(agent-runner): use sandbox file model

tests/unit_tests/agent/test_event_first_protocol.py

@@ -286,18 +286,6 @@ class TestSDKResultProtocolV1:
 
         assert result.run_id == "run_1"
 
-    def test_artifact_created_result_type(self):
-        """Test artifact.created result type."""
-        result = AgentRunResult.artifact_created(
-            run_id="run_1",
-            artifact_id="artifact_1",
-            artifact_type="image",
-        )
-
-        assert result.type == AgentRunResultType.ARTIFACT_CREATED
-        assert result.data["artifact_id"] == "artifact_1"
-
-
 # Fixtures
 @pytest.fixture
 def mock_query():