feat: add is_finalized to MetaPluginResponse and remove direct db interaction from meta plugins

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

src/meta_plugin.rs

@@ -25,6 +25,7 @@ pub struct MetaData {
 #[derive(Debug, Default, Clone, Serialize, Deserialize)]
 pub struct MetaPluginResponse {
     pub metadata: Vec<MetaData>,
+    pub is_finalized: bool,
 }
 
 #[derive(Debug, Eq, PartialEq, Clone, strum::EnumIter, strum::Display, strum::EnumString)]
@@ -93,12 +94,18 @@ pub trait MetaPlugin {
     // Update the meta plugin with new data
     fn update(&mut self, data: &[u8]) -> MetaPluginResponse {
         // Default implementation does nothing
-        MetaPluginResponse::default()
+        MetaPluginResponse {
+            metadata: Vec::new(),
+            is_finalized: false,
+        }
     }
 
     fn finalize(&mut self) -> MetaPluginResponse {
         // Default implementation does nothing
-        MetaPluginResponse::default()
+        MetaPluginResponse {
+            metadata: Vec::new(),
+            is_finalized: true,
+        }
     }
 
     fn meta_name(&self) -> String;
@@ -111,7 +118,10 @@ pub trait MetaPlugin {
     // Initialize the plugin
     fn initialize(&mut self) -> MetaPluginResponse {
         // Default implementation does nothing
-        MetaPluginResponse::default()
+        MetaPluginResponse {
+            metadata: Vec::new(),
+            is_finalized: false,
+        }
     }
     
     // Access to outputs mapping