fix: add std::io imports and update finalize return type

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

src/meta_plugin/system.rs

@@ -6,6 +6,7 @@ use std::env;
 use std::process;
 use uzers::{get_current_uid, get_current_gid, get_current_username, get_current_groupname};
 use rusqlite::Connection;
+use std::io;
 
 use crate::common::is_binary::is_binary;
 use crate::meta_plugin::MetaPlugin;
@@ -493,9 +494,9 @@ impl MetaPlugin for FullHostnameMetaPlugin {
         true
     }
     
-    fn finalize(&mut self) -> io::Result<String> {
-        // Since we save during initialize(), return empty to avoid duplicate saves
-        Ok("".to_string())
+    fn finalize(&mut self) -> Result<()> {
+        // Since we save during initialize(), return Ok to avoid duplicate saves
+        Ok(())
     }
 
     fn update(&mut self, _data: &[u8]) {