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_tier4_interceptor.py

@@ -3,7 +3,7 @@ from unittest.mock import MagicMock, patch
 import subprocess
 from shell_runner import run_powershell
 
-def test_run_powershell_qa_callback_on_failure():
+def test_run_powershell_qa_callback_on_failure() -> None:
  """
     Test that qa_callback is called when a powershell command fails (non-zero exit code).
     The result of the callback should be appended to the output.
@@ -27,7 +27,7 @@ def test_run_powershell_qa_callback_on_failure():
   assert "STDERR:\nsomething went wrong" in output
   assert "EXIT CODE: 1" in output
 
-def test_run_powershell_qa_callback_on_stderr_only():
+def test_run_powershell_qa_callback_on_stderr_only() -> None:
  """
     Test that qa_callback is called when a command has stderr even if exit code is 0.
     """
@@ -45,7 +45,7 @@ def test_run_powershell_qa_callback_on_stderr_only():
   assert "QA ANALYSIS: Ignorable warning." in output
   assert "STDOUT:\nSuccess" in output
 
-def test_run_powershell_no_qa_callback_on_success():
+def test_run_powershell_no_qa_callback_on_success() -> None:
  """
     Test that qa_callback is NOT called when the command succeeds without stderr.
     """
@@ -64,7 +64,7 @@ def test_run_powershell_no_qa_callback_on_success():
   assert "EXIT CODE: 0" in output
   assert "QA ANALYSIS" not in output
 
-def test_run_powershell_optional_qa_callback():
+def test_run_powershell_optional_qa_callback() -> None:
  """
     Test that run_powershell still works without providing a qa_callback.
     """
@@ -81,7 +81,7 @@ def test_run_powershell_optional_qa_callback():
   assert "STDERR:\nerror" in output
   assert "EXIT CODE: 1" in output
 
-def test_end_to_end_tier4_integration():
+def test_end_to_end_tier4_integration() -> None:
  """
     Verifies that shell_runner.run_powershell correctly uses ai_client.run_tier4_analysis.
     """
@@ -101,7 +101,7 @@ def test_end_to_end_tier4_integration():
   mock_analysis.assert_called_once_with(stderr_content)
   assert f"QA ANALYSIS:\n{expected_analysis}" in output
 
-def test_ai_client_passes_qa_callback():
+def test_ai_client_passes_qa_callback() -> None:
  """
     Verifies that ai_client.send passes the qa_callback down to the provider function.
     """
@@ -123,7 +123,7 @@ def test_ai_client_passes_qa_callback():
   # qa_callback is the 7th positional argument in _send_gemini
   assert args[6] == qa_callback
 
-def test_gemini_provider_passes_qa_callback_to_run_script():
+def test_gemini_provider_passes_qa_callback_to_run_script() -> None:
  """
     Verifies that _send_gemini passes the qa_callback to _run_script.
     """