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_headless_verification.py

@@ -6,7 +6,7 @@ import ai_client
 import json
 
 @pytest.mark.asyncio
-async def test_headless_verification_full_run():
+async def test_headless_verification_full_run() -> None:
  """
     1. Initialize a ConductorEngine with a Track containing multiple dependent Tickets.
     2. Simulate a full execution run using engine.run_linear().