refactor: update meta plugins to use MetaPluginResponse

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

src/meta_plugin/digest.rs

@@ -169,7 +169,7 @@ impl MetaPlugin for ReadTimeMetaPlugin {
         true
     }
     
-    fn finalize(&mut self) -> Result<PluginResponse> {
+    fn finalize(&mut self) -> Result<MetaPluginResponse> {
         let mut metadata = Vec::new();
 
         if let Some(start_time) = self.start_time {
@@ -183,17 +183,17 @@ impl MetaPlugin for ReadTimeMetaPlugin {
             }
         }
 
-        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> {
         if self.start_time.is_none() {
             self.start_time = Some(Instant::now());
         }
-        Ok(PluginResponse::default())
+        Ok(MetaPluginResponse::default())
     }
 
     fn meta_name(&self) -> String {
@@ -278,7 +278,7 @@ impl MetaPlugin for ReadRateMetaPlugin {
         true
     }
 
-    fn finalize(&mut self) -> Result<PluginResponse> {
+    fn finalize(&mut self) -> Result<MetaPluginResponse> {
         let mut metadata = Vec::new();
 
         if let Some(start_time) = self.start_time {
@@ -296,18 +296,18 @@ impl MetaPlugin for ReadRateMetaPlugin {
             }
         }
 
-        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> {
         if self.start_time.is_none() {
             self.start_time = Some(Instant::now());
         }
         self.bytes_read += data.len() as u64;
-        Ok(PluginResponse::default())
+        Ok(MetaPluginResponse::default())
     }
 
     fn meta_name(&self) -> String {