refactor: remove default_options method from MetaPlugin trait

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

src/meta_plugin/mod.rs

@@ -247,11 +247,6 @@ pub trait MetaPlugin where Self: 'static {
         Vec::new()
     }
     
-    // Get the default options for this plugin
-    fn default_options(&self) -> std::collections::HashMap<String, serde_yaml::Value> {
-        // Default implementation returns empty - plugins should override this
-        std::collections::HashMap::new()
-    }
     
     
     // Method to downcast to concrete type (for checking finalization state)