fix: remove duplicate TtyMetaPlugin implementation

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

src/meta_plugin/system.rs

@@ -359,42 +359,3 @@ impl MetaPlugin for FullHostnameMetaPlugin {
     }
 }
 
-#[derive(Debug, Clone, Default)]
-pub struct TtyMetaPlugin {
-    meta_name: String,
-}
-
-impl TtyMetaPlugin {
-    pub fn new() -> TtyMetaPlugin {
-        TtyMetaPlugin {
-            meta_name: "tty".to_string(),
-        }
-    }
-}
-
-impl MetaPlugin for TtyMetaPlugin {
-    fn create(&self) -> Result<Box<dyn Write>> {
-        Ok(Box::new(io::sink()))
-    }
-
-    fn finalize(&mut self) -> io::Result<String> {
-        // Use isatty::tty_path to get the current TTY path
-        match isatty::stdout_isatty() {
-            true => {
-                match isatty::tty_path() {
-                    Ok(path) => Ok(path.to_string_lossy().to_string()),
-                    Err(_) => Ok("unknown tty".to_string()),
-                }
-            },
-            false => Ok("not a tty".to_string()),
-        }
-    }
-
-    fn update(&mut self, _data: &[u8]) {
-        // No update needed for TTY
-    }
-
-    fn meta_name(&mut self) -> String {
-        self.meta_name.clone()
-    }
-}