refactor(types): auto -> None sweep across entire codebase

Applied 236 return type annotations to functions with no return values
across 100+ files (core modules, tests, scripts, simulations).
Added Phase 4 to python_style_refactor track for remaining 597 items
(untyped params, vars, and functions with return values).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_workflow_sim.py

@@ -8,12 +8,12 @@ sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
 
 from simulation.workflow_sim import WorkflowSimulator
 
-def test_simulator_instantiation():
+def test_simulator_instantiation() -> None:
  client = MagicMock()
  sim = WorkflowSimulator(client)
  assert sim is not None
 
-def test_setup_new_project():
+def test_setup_new_project() -> None:
  client = MagicMock()
  sim = WorkflowSimulator(client)
  # Mock responses for wait_for_server
@@ -24,7 +24,7 @@ def test_setup_new_project():
  client.set_value.assert_any_call("project_git_dir", "/tmp/test_git")
  client.click.assert_any_call("btn_project_save")
 
-def test_discussion_switching():
+def test_discussion_switching() -> None:
  client = MagicMock()
  sim = WorkflowSimulator(client)
  sim.create_discussion("NewDisc")
@@ -33,7 +33,7 @@ def test_discussion_switching():
  sim.switch_discussion("NewDisc")
  client.select_list_item.assert_called_with("disc_listbox", "NewDisc")
 
-def test_history_truncation():
+def test_history_truncation() -> None:
  client = MagicMock()
  sim = WorkflowSimulator(client)
  sim.truncate_history(3)