Mirrors the proxy/sso-manager docs-site layout (Jekyll + Bootstrap
default layout, theta42 assets). Documents the username grammar, the TUI
picker, SFTP/WinSCP, how auth/access/key-injection/bridging work, and the
three install paths + the required sshPublicKey write-ACL.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
