I list author-only stuff under `develop.requires`. A snippet from GraphQL's Makefile.PL:

WriteMakefile(
  NAME             => 'GraphQL',
# ...
  META_MERGE => {
    "meta-spec" => { version => 2 },
    dynamic_config => 0,
    resources => {
      x_IRC => 'irc://irc.perl.org/#graphql-perl',
      repository => {
        type => 'git',
        url => 'git@github.com:graphql-perl/graphql-perl.git',
        web => 'https://github.com/graphql-perl/graphql-perl',
      },
      bugtracker  => {
        web => 'https://github.com/graphql-perl/graphql-perl/issues',
      },
      license => [ 'http://dev.perl.org/licenses/' ],
    },
    prereqs => {
      develop => {
        requires => {
          'Test::Pod::Coverage' => '1.08',
          'Test::Pod' => '1.22',
          'Pod::Markdown' => 0,
        },
      },
      runtime => {
        suggests => {
          'Cpanel::JSON::XS' => '3.0237',
          'JSON::XS' => 0,
        },
      },
    },
  },
);
[download]

That lets me minimise or avoid specifying them separately in continuous integration (CI) config.