perf: replace inefficient memory cloning vectors with fast zero-allocation read iterators

server/src/handlers_v2/env.rs

@@ -155,9 +155,12 @@ impl McpTool for GetEnvironmentDetailsHandler {
     async fn execute(&self, args: Value, state: Arc<MemoryState>) -> Result<String, String> {
         let req: GetEnvironmentDetailsTool =
             serde_json::from_value(args).map_err(|e| e.to_string())?;
-        let mut envs = state.environments.read();
-        envs.retain(|e| e.namespace == req.namespace);
-        let data = serde_json::to_string(&envs).unwrap_or_default();
+        let data = state.environments.read_with(|envs| {
+            let filtered: Vec<_> = envs.iter().filter(|e| e.namespace == req.namespace).collect();
+            serde_json::to_string(&filtered).unwrap_or_default()
+        });
         Ok(data.to_string())
     }
 }
+
+