refactor: update response types to MetaPluginResponse

Co-authored-by: aider (openai/andrew/openrouter/mistralai/mistral-medium-3.1) <aider@aider.chat>

src/meta_plugin/digest.rs

@@ -58,12 +58,12 @@ impl MetaPlugin for DigestSha256MetaPlugin {
         true
     }
     
-    fn initialize(&mut self, item_id: i64) -> Result<PluginResponse> {
+    fn initialize(&mut self, item_id: i64) -> Result<MetaPluginResponse> {
         self.item_id = Some(item_id);
-        Ok(PluginResponse::default())
+        Ok(MetaPluginResponse::default())
     }
-    
-    fn finalize(&mut self) -> Result<PluginResponse> {
+
+    fn finalize(&mut self) -> Result<MetaPluginResponse> {
         let mut metadata = Vec::new();
 
         if let Some(item_id) = self.item_id {
@@ -77,15 +77,15 @@ impl MetaPlugin for DigestSha256MetaPlugin {
             }
         }
 
-        Ok(PluginResponse {
+        Ok(MetaPluginResponse {
             metadata: Some(metadata),
             is_finalized: true,
         })
     }
 
-    fn update(&mut self, data: &[u8]) -> Result<PluginResponse> {
+    fn update(&mut self, data: &[u8]) -> Result<MetaPluginResponse> {
         self.hasher.update(data);
-        Ok(PluginResponse::default())
+        Ok(MetaPluginResponse::default())
     }
 
     fn meta_name(&self) -> String {