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>

conductor/tests/test_mma_exec.py

@@ -3,7 +3,7 @@ import os
 from unittest.mock import patch, MagicMock
 from scripts.mma_exec import create_parser, get_role_documents, execute_agent, get_model_for_role, get_dependencies
 
-def test_parser_role_choices():
+def test_parser_role_choices() -> None:
  """Test that the parser accepts valid roles and the prompt argument."""
  parser = create_parser()
  valid_roles = ['tier1', 'tier2', 'tier3', 'tier4']
@@ -13,13 +13,13 @@ def test_parser_role_choices():
   assert args.role == role
   assert args.prompt == test_prompt
 
-def test_parser_invalid_role():
+def test_parser_invalid_role() -> None:
  """Test that the parser rejects roles outside the specified choices."""
  parser = create_parser()
  with pytest.raises(SystemExit):
   parser.parse_args(['--role', 'tier5', 'Some prompt'])
 
-def test_parser_prompt_optional():
+def test_parser_prompt_optional() -> None:
  """Test that the prompt argument is optional if role is provided (or handled in main)."""
  parser = create_parser()
  # Prompt is now optional (nargs='?')
@@ -27,28 +27,28 @@ def test_parser_prompt_optional():
  assert args.role == 'tier3'
  assert args.prompt is None
 
-def test_parser_help():
+def test_parser_help() -> None:
  """Test that the help flag works without raising errors (exits with 0)."""
  parser = create_parser()
  with pytest.raises(SystemExit) as excinfo:
   parser.parse_args(['--help'])
  assert excinfo.value.code == 0
 
-def test_get_role_documents():
+def test_get_role_documents() -> None:
  """Test that get_role_documents returns the correct documentation paths for each tier."""
  assert get_role_documents('tier1') == ['conductor/product.md', 'conductor/product-guidelines.md']
  assert get_role_documents('tier2') == ['conductor/tech-stack.md', 'conductor/workflow.md']
  assert get_role_documents('tier3') == ['conductor/workflow.md']
  assert get_role_documents('tier4') == []
 
-def test_get_model_for_role():
+def test_get_model_for_role() -> None:
  """Test that get_model_for_role returns the correct model for each role."""
  assert get_model_for_role('tier1-orchestrator') == 'gemini-3.1-pro-preview'
  assert get_model_for_role('tier2-tech-lead') == 'gemini-2.5-flash-lite'
  assert get_model_for_role('tier3-worker') == 'gemini-2.5-flash-lite'
  assert get_model_for_role('tier4-qa') == 'gemini-2.5-flash-lite'
 
-def test_execute_agent():
+def test_execute_agent() -> None:
  """
     Test that execute_agent calls subprocess.run with powershell and the correct gemini CLI arguments
     including the model specified for the role.