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>

reproduce_missing_hints.py

@@ -1,7 +1,7 @@
 import subprocess
 import sys
 
-def test_type_hints():
+def test_type_hints() -> None:
  files = ["project_manager.py", "session_logger.py"]
  all_missing = []
  for f in files: