fix: implement debug for MetaPluginCommand

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/meta_plugin/command.rs

@@ -5,7 +5,6 @@ use which::which;
 
 use crate::meta_plugin::{MetaPlugin, MetaPluginResponse, MetaPluginType};
 
-#[derive(Debug)]
 pub struct MetaPluginCommand {
     pub program: String,
     pub args: Vec<String>,
@@ -18,6 +17,23 @@ pub struct MetaPluginCommand {
     options: std::collections::HashMap<String, serde_yaml::Value>,
 }
 
+// Manual Debug implementation because Box<dyn Write> doesn't implement Debug
+impl std::fmt::Debug for MetaPluginCommand {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("MetaPluginCommand")
+            .field("program", &self.program)
+            .field("args", &self.args)
+            .field("supported", &self.supported)
+            .field("split_whitespace", &self.split_whitespace)
+            .field("process", &self.process)
+            .field("writer", &self.writer.as_ref().map(|_| "Box<dyn Write>"))
+            .field("result", &self.result)
+            .field("outputs", &self.outputs)
+            .field("options", &self.options)
+            .finish()
+    }
+}
+
 
 impl MetaPluginCommand {
     pub fn new(