Git & SSH Identity

Sets up who-you-are for git: identity, keys, auth, signing, and the config defaults core git developers actually use. Owns ~/.gitconfig (via git config --global, inherently idempotent) and ~/.ssh/config's GitHub block.

When NOT to use

• Git workflows (rebase, merge, commit messages) → native competence
• Installing git/gh binaries → dev-cli-tools
• Repo-side settings (branch protection, secrets) → not a machine-setup task
• Touch ID / FileVault → macos-security-baseline

Safety rails