fix: preserve cross-device evidence and render recorded reports

tests/unit/data_engine/test_engine.py

@@ -229,7 +229,7 @@ def test_video_recording_persistence(tmp_path):
     assert updated.status == "ready"
 
 
-def test_record_step_suppresses_identical_post_screenshot(tmp_path):
+def test_record_step_retains_identical_post_capture_without_duplicating_file(tmp_path):
     mock_ctx = MagicMock(spec=ArtemisContext)
     mock_execution_setup = MagicMock()
     mock_execution_setup.traces_path = str(tmp_path)
@@ -251,11 +251,11 @@ def test_record_step_suppresses_identical_post_screenshot(tmp_path):
     step_record = engine.storage.get_steps(engine.current_session_id)[0]
     assert step_record is not None
     assert step_record.pre_image_name is not None
-    # post_image_name must be None when no visual transition occurred
-    assert step_record.post_image_name is None
+    assert step_record.post_image_name == step_record.pre_image_name
+    assert len(list((tmp_path / "images").iterdir())) == 1
 
 
-def test_update_step_execution_result_suppresses_identical_post_screenshot(tmp_path):
+def test_update_step_execution_result_retains_identical_post_capture(tmp_path):
     mock_ctx = MagicMock(spec=ArtemisContext)
     mock_execution_setup = MagicMock()
     mock_execution_setup.traces_path = str(tmp_path)
@@ -284,7 +284,7 @@ def test_update_step_execution_result_suppresses_identical_post_screenshot(tmp_p
     )
 
     updated_step = engine.storage.get_steps(engine.current_session_id)[0]
-    assert updated_step.post_image_name is None
+    assert updated_step.post_image_name == updated_step.pre_image_name
 
     # Update with distinct post_image_name
     engine.storage.update_step_execution_result(