feat: display default options for digest and magic_file plugins

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

src/meta_plugin/digest.rs

@@ -126,6 +126,8 @@ impl DigestMetaPlugin {
         // Default to sha256 if no valid method is specified
         if plugin.hasher.is_none() {
             plugin.hasher = Some(Hasher::Sha256(Sha256::new()));
+            // Add the default method to options so it shows up in the status
+            plugin.options.insert("method".to_string(), serde_yaml::Value::String("sha256".to_string()));
         }
         
         plugin