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_history_management.py

@@ -164,7 +164,7 @@ def test_history_persistence_across_turns(tmp_path):
  assert len(proj_final["discussion"]["discussions"]["main"]["history"]) == 2
  # --- Tests for AI Client History Management ---
 
-def test_get_history_bleed_stats_basic():
+def test_get_history_bleed_stats_basic() -> None:
  """
     Tests basic retrieval of history bleed statistics from the AI client.
     """