docs: def get_help_keys(self):
          """
          Returns dict of help_context keys (description texts used in `EmailRegistry.register()` method).
          """
          help_keys = {}
          for k, v in self.help_context.items():
              if isinstance(v, tuple):
                  help_keys[k] = v[0]
              else:
                  help_keys[k] = v
          return help_keys