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>

scripts/tool_discovery.py

@@ -13,7 +13,7 @@ except ImportError as e:
  print("[]")
  sys.exit(0)
 
-def main():
+def main() -> None:
  specs = list(mcp_client.MCP_TOOL_SPECS)
  # Add run_powershell (manually define to match ai_client.py)
  specs.append({