fix: resolve duplicate imports and add log::debug prefixes

src/main.rs

@@ -1,10 +1,4 @@
-use nix::fcntl::FdFlag;
-use nix::unistd::{close, pipe};
-use nix::Error as NixError;
-use std::io::Read;
-use std::os::fd::FromRawFd;
 use std::path::PathBuf;
-use std::process::Stdio; // For Stdio::null, Stdio::piped
 
 use anyhow::{anyhow, Context, Error, Result};
 use clap::error::ErrorKind;