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_ast_parser_curated.py

@@ -1,7 +1,7 @@
 import pytest
 from file_cache import ASTParser
 
-def test_ast_parser_get_curated_view():
+def test_ast_parser_get_curated_view() -> None:
  parser = ASTParser("python")
  code = '''
 @core_logic