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_conductor_tech_lead.py

@@ -48,12 +48,12 @@ class TestConductorTechLead(unittest.TestCase):
   self.assertEqual(tickets, [])
 
 class TestTopologicalSort(unittest.TestCase):
- def test_topological_sort_empty(self):
+ def test_topological_sort_empty(self) -> None:
   tickets = []
   sorted_tickets = conductor_tech_lead.topological_sort(tickets)
   self.assertEqual(sorted_tickets, [])
 
- def test_topological_sort_linear(self):
+ def test_topological_sort_linear(self) -> None:
   tickets = [
    {"id": "t2", "depends_on": ["t1"]},
    {"id": "t1", "depends_on": []},
@@ -82,7 +82,7 @@ class TestTopologicalSort(unittest.TestCase):
   self.assertEqual(ids[-1], "t4")
   self.assertSetEqual(set(ids[1:3]), {"t2", "t3"})
 
- def test_topological_sort_cycle(self):
+ def test_topological_sort_cycle(self) -> None:
   tickets = [
    {"id": "t1", "depends_on": ["t2"]},
    {"id": "t2", "depends_on": ["t1"]},