Extends the tool to support both commit and tag formatting: - Add git-formatted-tag mode for annotated tag formatting - Add install subcommand to create symlinks in ~/.local/bin - Extract shared code (runGitWithStdin, validateSubjectLength) to git.go - Update module path to git.secluded.site/git-format BREAKING CHANGE: Renamed from formatted-commit to git-format. Uninstall the old binary and reinstall following README instructions. Run git-format install to create symlinks, then invoke via git formatted-commit or git formatted-tag.