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_gui2_performance.py

@@ -55,7 +55,7 @@ def test_performance_benchmarking(live_gui):
   assert avg_fps >= 30, f"{gui_script} FPS {avg_fps:.2f} is below 30 FPS threshold"
   assert avg_ft <= 33.3, f"{gui_script} Frame time {avg_ft:.2f}ms is above 33.3ms threshold"
 
-def test_performance_parity():
+def test_performance_parity() -> None:
  """
     Compare the metrics collected in the parameterized test_performance_benchmarking.
     """