feat: update finalize to return Result<()> and simplify save mode

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

src/meta_plugin/program.rs

@@ -84,44 +84,9 @@ impl MetaPlugin for MetaPluginProgram {
         Ok(())
     }
 
-    fn finalize(&mut self) -> io::Result<String> {
+    fn finalize(&mut self) -> Result<()> {
         debug!("META: Finalizing program plugin");
-
-        // Close stdin to signal EOF to the process
-        self.writer.take();
-
-        if let Some(process) = self.process.take() {
-            let output = process.wait_with_output()
-                .map_err(|e| io::Error::new(io::ErrorKind::Other, format!("Failed to wait for process: {}", e)))?;
-
-            if output.status.success() {
-                let stdout = String::from_utf8_lossy(&output.stdout);
-                let trimmed_result = stdout.trim();
-                
-                // For certain programs, we only want the first part before whitespace
-                if self.split_whitespace {
-                    let parts: Vec<&str> = trimmed_result.split_whitespace().collect();
-                    if !parts.is_empty() {
-                        Ok(parts[0].to_string())
-                    } else {
-                        Ok(trimmed_result.to_string())
-                    }
-                } else {
-                    Ok(trimmed_result.to_string())
-                }
-            } else {
-                let stderr = String::from_utf8_lossy(&output.stderr);
-                Err(io::Error::new(
-                    io::ErrorKind::Other,
-                    format!("Command failed: {}", stderr.trim()),
-                ))
-            }
-        } else {
-            Err(io::Error::new(
-                io::ErrorKind::Other,
-                "No process to finalize".to_string(),
-            ))
-        }
+        Ok(())
     }
 
     fn update(&mut self, data: &[u8]) {