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_orchestrator_pm_history.py

@@ -7,7 +7,7 @@ from pathlib import Path
 import orchestrator_pm
 
 class TestOrchestratorPMHistory(unittest.TestCase):
- def setUp(self):
+ def setUp(self) -> None:
   self.test_dir = Path("test_conductor")
   self.test_dir.mkdir(exist_ok=True)
   self.archive_dir = self.test_dir / "archive"
@@ -15,7 +15,7 @@ class TestOrchestratorPMHistory(unittest.TestCase):
   self.archive_dir.mkdir(exist_ok=True)
   self.tracks_dir.mkdir(exist_ok=True)
 
- def tearDown(self):
+ def tearDown(self) -> None:
   if self.test_dir.exists():
    shutil.rmtree(self.test_dir)