Standalone, sourceable script that installs the gh CLI and runs
interactive gh auth login. Any agent script on any cloud can source
it and call ensure_github_auth to get authenticated with GitHub.
- ensure_gh_cli: installs via brew/apt/dnf/binary fallback
- ensure_gh_auth: uses GITHUB_TOKEN or interactive OAuth flow
- ensure_github_auth: combined convenience wrapper
- Idempotent, macOS bash 3.x compatible, curl|bash compatible
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
