Add GitHub Actions workflows for CI and CPAN release CI workflow: - Runs tests on push/PR across Perl 5.14 through 5.40 - Validates compatibility with the minimum supported version Release workflow: - Triggers on GitHub release publication - Builds distribution tarball and uploads to CPAN - Requires CPAN_USERNAME and CPAN_PASSWORD repository secrets https://claude.ai/code/session_018RtsaLPCF2azHAQ1a6W7vk