Constant USAGE 

pub const USAGE: &str = "usage: mobius-gateway [--state-dir PATH]\n       \
                     mobius-gateway provider [--state-dir PATH]\n       \
                     mobius-gateway init [--state-dir PATH] [--listen ADDR] \
                     [--tls-cert PATH --tls-key PATH] \
                     [--cloudflare-hostname HOST --cloudflare-token-file PATH]\n       \
                     mobius-gateway bootstrap [--state-dir PATH]\n       \
                     mobius-gateway reset-default-agent [--state-dir PATH]\n       \
                     mobius-gateway pairing-code [--state-dir PATH] --json\n       \
                     mobius-gateway register-provider [--state-dir PATH] --provider ID \
                     --model ID [--instance ID] [--label TEXT] \
                     [--reasoning-efforts CSV] [--web-search off|cached|live] \
                     [--base-url URL] \
                     [--credentialless | --credential-stdin]\n       \
                     mobius-gateway connect [--state-dir PATH] [--endpoint ENDPOINT]\n       \
                     mobius-gateway serve [--state-dir PATH] [--background]\n       \
                     mobius-gateway exit [--state-dir PATH]";