fix: update trait and remove unused io imports

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/meta_plugin/digest.rs

@@ -1,6 +1,5 @@
 use anyhow::Result;
 use sha2::{Digest, Sha256};
-use std::io;
 use std::time::Instant;
 
 use crate::meta_plugin::MetaPlugin;

src/meta_plugin/magic.rs

@@ -1,6 +1,5 @@
 use anyhow::Result;
 use magic::{Cookie, CookieFlags};
-use std::io;
 use rusqlite::Connection;
 
 use crate::meta_plugin::MetaPlugin;

src/meta_plugin/program.rs

@@ -1,6 +1,5 @@
 use anyhow::{Context, Result, anyhow};
 use log::*;
-use std::io;
 use std::io::Write;
 use std::process::{Command, Stdio, Child};
 use which::which;

src/meta_plugin/system.rs

@@ -2,7 +2,6 @@ use anyhow::Result;
 use gethostname::gethostname;
 use local_ip_address::local_ip;
 use dns_lookup::lookup_addr;
-use std::io;
 use std::env;
 use std::process;
 use uzers::{get_current_uid, get_current_gid, get_current_username, get_current_groupname};