feat(simulation): add discussion switching and truncation simulation logic

tests/test_workflow_sim.py

@@ -26,3 +26,22 @@ def test_setup_new_project():
     client.click.assert_any_call("btn_project_new")
     client.set_value.assert_any_call("project_git_dir", "/tmp/test_git")
     client.click.assert_any_call("btn_project_save")
+
+def test_discussion_switching():
+    client = MagicMock()
+    sim = WorkflowSimulator(client)
+    
+    sim.create_discussion("NewDisc")
+    client.set_value.assert_called_with("disc_new_name_input", "NewDisc")
+    client.click.assert_called_with("btn_disc_create")
+    
+    sim.switch_discussion("NewDisc")
+    client.select_list_item.assert_called_with("disc_listbox", "NewDisc")
+
+def test_history_truncation():
+    client = MagicMock()
+    sim = WorkflowSimulator(client)
+    
+    sim.truncate_history(3)
+    client.set_value.assert_called_with("disc_truncate_pairs", 3)
+    client.click.assert_called_with("btn_disc_truncate")