Gather the CLI command modules into a commands sub-package

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tools/tests/test_main.py

@@ -11,7 +11,8 @@ import unittest
 from contextlib import redirect_stderr, redirect_stdout
 from unittest import mock
 
-from pop_fem_audit_tools import __main__, run_llm
+from pop_fem_audit_tools import __main__
+from pop_fem_audit_tools.commands import run_llm
 
 
 class TestDispatcher(unittest.TestCase):