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>

dag_engine.py

@@ -7,7 +7,7 @@ class TrackDAG:
     Provides methods for dependency resolution, cycle detection, and topological sorting.
     """
 
- def __init__(self, tickets: List[Ticket]):
+ def __init__(self, tickets: List[Ticket]) -> None:
   """
         Initializes the TrackDAG with a list of Ticket objects.
         Args:
@@ -99,7 +99,7 @@ class ExecutionEngine:
     Handles automatic queueing and manual task approval.
     """
 
- def __init__(self, dag: TrackDAG, auto_queue: bool = False):
+ def __init__(self, dag: TrackDAG, auto_queue: bool = False) -> None:
   """
         Initializes the ExecutionEngine.
         Args:
@@ -123,7 +123,7 @@ class ExecutionEngine:
      ticket.status = "in_progress"
   return ready
 
- def approve_task(self, task_id: str):
+ def approve_task(self, task_id: str) -> None:
   """
         Manually transitions a task from 'todo' to 'in_progress' if its dependencies are met.
         Args:
@@ -141,7 +141,7 @@ class ExecutionEngine:
    if all_done:
     ticket.status = "in_progress"
 
- def update_task_status(self, task_id: str, status: str):
+ def update_task_status(self, task_id: str, status: str) -> None:
   """
         Force-updates the status of a specific task.
         Args: