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>

models.py

@@ -17,12 +17,12 @@ class Ticket:
  blocked_reason: Optional[str] = None
  step_mode: bool = False
 
- def mark_blocked(self, reason: str):
+ def mark_blocked(self, reason: str) -> None:
   """Sets the ticket status to 'blocked' and records the reason."""
   self.status = "blocked"
   self.blocked_reason = reason
 
- def mark_complete(self):
+ def mark_complete(self) -> None:
   """Sets the ticket status to 'completed'."""
   self.status = "completed"