feat: add duplicate output name check for meta plugins

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

src/services/meta_service.rs

@@ -80,6 +80,27 @@ impl MetaService {
         conn: &Connection,
         item_id: i64,
     ) {
+        // Check for duplicate output names before initializing plugins
+        let mut output_names: std::collections::HashMap<String, Vec<String>> = std::collections::HashMap::new();
+        
+        for plugin in plugins.iter() {
+            let plugin_name = plugin.meta_name();
+            for output_name in plugin.outputs().keys() {
+                output_names.entry(output_name.clone())
+                    .or_insert_with(Vec::new)
+                    .push(plugin_name.clone());
+            }
+        }
+        
+        // Print warnings for duplicate output names
+        for (output_name, plugin_names) in &output_names {
+            if plugin_names.len() > 1 {
+                eprintln!("Warning: Output name '{}' is provided by multiple plugins: {}", 
+                         output_name, 
+                         plugin_names.join(", "));
+            }
+        }
+        
         for meta_plugin in plugins.iter_mut() {
             if let Err(e) = meta_plugin.initialize(conn, item_id) {
                 eprintln!("Warning: Failed to initialize meta plugin: {}", e);