fix: register check-dco console_scripts entry point

Author: Hermes Agent

setup.cfg

@@ -60,6 +60,7 @@ console_scripts =
     requirements-txt-fixer = pre_commit_hooks.requirements_txt_fixer:main
     sort-simple-yaml = pre_commit_hooks.sort_simple_yaml:main
     trailing-whitespace-fixer = pre_commit_hooks.trailing_whitespace_fixer:main
+    check-dco = pre_commit_hooks.check_dco:main
 
 [bdist_wheel]
 universal = True