Script handles:
- Generating ed25519 SSH key if not present
- Setting up SSH for existing users
- Creating new users via admin account with:
- Home directory and .ssh setup
- sudo/wheel group membership
- Passwordless sudo configuration
- Connection verification
Usage: ./scripts/setup-ssh.sh <ip> <user> [admin_user]
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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