refactor: update empty hashmap initialization with lazy initialization

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

src/meta_plugin/binary.rs

@@ -69,9 +69,10 @@ impl MetaPlugin for BinaryMetaPlugin {
             }
         }
 
+        let is_finalized = !metadata.is_empty();
         MetaPluginResponse {
             metadata,
-            is_finalized: !metadata.is_empty(),
+            is_finalized,
         }
     }
 
@@ -121,7 +122,7 @@ impl MetaPlugin for BinaryMetaPlugin {
         self.base.options_mut()
     }
     
-    fn configure_options(&mut self, options: &std::collections::HashMap<String, serde_yaml::Value>) -> Result<()> {
+    fn configure_options(&mut self, options: &std::collections::HashMap<String, serde_yaml::Value>) -> anyhow::Result<()> {
         if let Some(max_buffer_size) = options.get("max_buffer_size") {
             if let Some(size) = max_buffer_size.as_u64() {
                 self.max_buffer_size = size as usize;