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>

events.py

@@ -9,11 +9,11 @@ class EventEmitter:
     Simple event emitter for decoupled communication between modules.
     """
 
- def __init__(self):
+ def __init__(self) -> None:
   """Initializes the EventEmitter with an empty listener map."""
   self._listeners: Dict[str, List[Callable]] = {}
 
- def on(self, event_name: str, callback: Callable):
+ def on(self, event_name: str, callback: Callable) -> None:
   """
         Registers a callback for a specific event.
         
@@ -25,7 +25,7 @@ class EventEmitter:
    self._listeners[event_name] = []
   self._listeners[event_name].append(callback)
 
- def emit(self, event_name: str, *args: Any, **kwargs: Any):
+ def emit(self, event_name: str, *args: Any, **kwargs: Any) -> None:
   """
         Emits an event, calling all registered callbacks.
         
@@ -43,11 +43,11 @@ class AsyncEventQueue:
     Asynchronous event queue for decoupled communication using asyncio.Queue.
     """
 
- def __init__(self):
+ def __init__(self) -> None:
   """Initializes the AsyncEventQueue with an internal asyncio.Queue."""
   self._queue: asyncio.Queue = asyncio.Queue()
 
- async def put(self, event_name: str, payload: Any = None):
+ async def put(self, event_name: str, payload: Any = None) -> None:
   """
         Puts an event into the queue.
         
@@ -71,7 +71,7 @@ class UserRequestEvent:
     Payload for a user request event.
     """
 
- def __init__(self, prompt: str, stable_md: str, file_items: List[Any], disc_text: str, base_dir: str):
+ def __init__(self, prompt: str, stable_md: str, file_items: List[Any], disc_text: str, base_dir: str) -> None:
   self.prompt = prompt
   self.stable_md = stable_md
   self.file_items = file_items