perf: fix store mem leak, batch DB flushes, and remove double-clones

server/src/state.rs

@@ -63,10 +63,10 @@ impl MemoryState {
     pub async fn rebuild_index(&self) {
         if let Ok(new_idx) = MemoryIndex::new(&self.base_dir) {
             
-            let entities = self.graph.read().entities.values().cloned().collect();
-            let tasks = self.tasks.read().clone();
-            let snippets = self.snippets.read().clone();
-            let adrs = self.adrs.read().clone();
+            let entities = self.graph.read().entities.into_values().collect();
+            let tasks = self.tasks.read();
+            let snippets = self.snippets.read();
+            let adrs = self.adrs.read();
 
             let handle = new_idx.index_batch(entities, tasks, snippets, adrs);
             let _ = handle.await;