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/visual_mma_verification.py

@@ -23,7 +23,7 @@ except ImportError as e:
  print(f"Import error: {e}")
  sys.exit(1)
 
-def run_visual_mma_verification():
+def run_visual_mma_verification() -> None:
  print("Starting visual MMA verification test...")
  # Change current directory to project root
  original_dir = os.getcwd()