Refactor: Dismantle MemoryState into semantic domain sub-structs

server/src/indexer.rs

@@ -81,7 +81,7 @@ pub async fn start_background_indexer(state: Arc<MemoryState>) {
                                 embedding,
                             };
 
-                            state.snippets.modify(|snippets| {
+                            state.code.snippets.modify(|snippets| {
                                 // Prevent duplicates if already indexed
                                 if !snippets.iter().any(|s| s.name == snippet.name) {
                                     snippets.push(snippet.clone());