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.py

@@ -2,12 +2,12 @@ import pytest
 import tree_sitter
 from file_cache import ASTParser
 
-def test_ast_parser_initialization():
+def test_ast_parser_initialization() -> None:
  """Verify that ASTParser can be initialized with a language string."""
  parser = ASTParser("python")
  assert parser.language_name == "python"
 
-def test_ast_parser_parse():
+def test_ast_parser_parse() -> None:
  """Verify that the parse method returns a tree_sitter.Tree."""
  parser = ASTParser("python")
  code = """def example_func():
@@ -17,7 +17,7 @@ def test_ast_parser_parse():
  # Basic check that it parsed something
  assert tree.root_node.type == "module"
 
-def test_ast_parser_get_skeleton_python():
+def test_ast_parser_get_skeleton_python() -> None:
  """Verify that get_skeleton replaces function bodies with '...' while preserving docstrings."""
  parser = ASTParser("python")
  code = '''
@@ -51,14 +51,14 @@ class MyClass:
  assert "return result" not in skeleton
  assert 'print("doing something")' not in skeleton
 
-def test_ast_parser_invalid_language():
+def test_ast_parser_invalid_language() -> None:
  """Verify handling of unsupported or invalid languages."""
  # This might raise an error or return a default, depending on implementation
  # For now, we expect it to either fail gracefully or raise an exception we can catch
  with pytest.raises(Exception):
   ASTParser("not-a-language")
 
-def test_ast_parser_get_curated_view():
+def test_ast_parser_get_curated_view() -> None:
  """Verify that get_curated_view preserves function bodies with @core_logic or # [HOT]."""
  parser = ASTParser("python")
  code = '''