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>

conductor/tests/test_infrastructure.py

@@ -18,7 +18,7 @@ def run_ps_script(role, prompt):
   print(f"\n[Sub-Agent {role} Error]:\n{result.stderr}")
  return result
 
-def test_subagent_script_qa_live():
+def test_subagent_script_qa_live() -> None:
  """Verify that the QA role works and returns a compressed fix."""
  prompt = "Traceback (most recent call last): File 'test.py', line 1, in <module> 1/0 ZeroDivisionError: division by zero"
  result = run_ps_script("QA", prompt)
@@ -28,7 +28,7 @@ def test_subagent_script_qa_live():
  # It should be short (QA agents compress)
  assert len(result.stdout.split()) < 40
 
-def test_subagent_script_worker_live():
+def test_subagent_script_worker_live() -> None:
  """Verify that the Worker role works and returns code."""
  prompt = "Write a python function that returns 'hello world'"
  result = run_ps_script("Worker", prompt)
@@ -36,14 +36,14 @@ def test_subagent_script_worker_live():
  assert "def" in result.stdout.lower()
  assert "hello" in result.stdout.lower()
 
-def test_subagent_script_utility_live():
+def test_subagent_script_utility_live() -> None:
  """Verify that the Utility role works."""
  prompt = "Tell me 'True' if 1+1=2, otherwise 'False'"
  result = run_ps_script("Utility", prompt)
  assert result.returncode == 0
  assert "true" in result.stdout.lower()
 
-def test_subagent_isolation_live():
+def test_subagent_isolation_live() -> None:
  """Verify that the sub-agent is stateless and does not see the parent's conversation context."""
  # This prompt asks the sub-agent about a 'secret' mentioned only here, not in its prompt.
  prompt = "What is the secret code I just told you? If I didn't tell you, say 'UNKNOWN'."