refactor: remove verification field from responses and update related documentation

tests/test_agent_tools.py

@@ -71,13 +71,9 @@ def test_task_complete_captures_return_and_data(tmp_path: Path, monkeypatch) ->
     assert result["ok"] is True
     assert result["return"] == "Task completed successfully"
     assert result["data"] == "file1\nfile2"
-    assert result["verification"]["ok"] is True
-    verification_path = Path(result["verification"]["path"])
-    assert verification_path.exists()
-    assert verification_path.name.startswith("screen_final_verification_step_")
+    assert "verification" not in result
     assert agent.final_result == "Task completed successfully"
     assert agent.final_data == "file1\nfile2"
-    assert agent.final_verification is not None
 
 
 def test_click_supports_directional_offsets(tmp_path: Path, monkeypatch) -> None: