//! The `nichlink` entry binary: process glue for the command-line interface.
//! `nichlink` 入口二进制:命令行界面的进程粘合层。
//!
//! `main` forwards straight to `nichlink_cli::main`, which dispatches the argv
//! NichLink was invoked with. A failure is printed to stderr and exits non-zero,
//! so a shell pipeline sees the command fail.
//! `main` 直接转发给 `nichlink_cli::main`,由它分发 NichLink 被调用时的 argv。
//! 失败时打印到 stderr 并以非零码退出,因此 shell 管线能看见命令失败。