refactor: change meta_name to immutable reference and add debugging

Co-authored-by: aider (openai/andrew/openrouter/anthropic/claude-sonnet-4) <aider@aider.chat>

src/meta_plugin.rs

@@ -88,7 +88,7 @@ pub trait MetaPlugin {
     // Update the meta plugin with new data
     fn update(&mut self, data: &[u8], conn: &Connection);
 
-    fn meta_name(&mut self) -> String;
+    fn meta_name(&self) -> String;
     
     // Get program information for display in status
     fn program_info(&self) -> Option<(&str, Vec<&str>)> {