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_log_registry.py

@@ -8,7 +8,7 @@ from log_registry import LogRegistry
 
 class TestLogRegistry(unittest.TestCase):
 
- def setUp(self):
+ def setUp(self) -> None:
   """Set up a temporary directory and registry file for each test."""
   self.temp_dir = tempfile.TemporaryDirectory()
   self.registry_path = os.path.join(self.temp_dir.name, "registry.toml")
@@ -19,11 +19,11 @@ class TestLogRegistry(unittest.TestCase):
    # Instantiate LogRegistry. This will load from the empty file.
   self.registry = LogRegistry(self.registry_path)
 
- def tearDown(self):
+ def tearDown(self) -> None:
   """Clean up the temporary directory and its contents after each test."""
   self.temp_dir.cleanup()
 
- def test_instantiation(self):
+ def test_instantiation(self) -> None:
   """Test LogRegistry instantiation with a file path."""
   self.assertIsInstance(self.registry, LogRegistry)
   self.assertEqual(self.registry.registry_path, self.registry_path)
@@ -31,7 +31,7 @@ class TestLogRegistry(unittest.TestCase):
   self.assertTrue(os.path.exists(self.registry_path))
   # We will verify content in other tests that explicitly save and reload.
 
- def test_register_session(self):
+ def test_register_session(self) -> None:
   """Test registering a new session."""
   session_id = "session-123"
   path = "/path/to/session/123"
@@ -53,7 +53,7 @@ class TestLogRegistry(unittest.TestCase):
   reloaded_start_time = datetime.fromisoformat(reloaded_session_data['start_time'])
   self.assertAlmostEqual(reloaded_start_time, start_time, delta=timedelta(seconds=1))
 
- def test_update_session_metadata(self):
+ def test_update_session_metadata(self) -> None:
   """Test updating session metadata."""
   session_id = "session-456"
   path = "/path/to/session/456"
@@ -84,7 +84,7 @@ class TestLogRegistry(unittest.TestCase):
   self.assertTrue(reloaded_session_data.get('metadata', {}).get('whitelisted', False))
   self.assertTrue(reloaded_session_data.get('whitelisted', False)) # Check main flag too
 
- def test_is_session_whitelisted(self):
+ def test_is_session_whitelisted(self) -> None:
   """Test checking if a session is whitelisted."""
   session_id_whitelisted = "session-789-whitelisted"
   path_w = "/path/to/session/789"
@@ -102,7 +102,7 @@ class TestLogRegistry(unittest.TestCase):
   # Test for a non-existent session, should be treated as not whitelisted
   self.assertFalse(self.registry.is_session_whitelisted("non-existent-session"))
 
- def test_get_old_non_whitelisted_sessions(self):
+ def test_get_old_non_whitelisted_sessions(self) -> None:
   """Test retrieving old, non-whitelisted sessions."""
   now = datetime.utcnow()
   # Define a cutoff time that is 7 days ago