perf: completely eradicate large vector allocations and state locking double-clones in main, meta, env, workspaces, and notes modules

server/src/handlers_v2/env.rs

@@ -61,9 +61,11 @@ impl McpTool for ReadEnvFingerprintHandler {
     async fn execute(&self, args: Value, state: Arc<MemoryState>) -> Result<String, String> {
         let req: ReadEnvFingerprintTool =
             serde_json::from_value(args).map_err(|e| e.to_string())?;
-        let fps = state.env_fingerprints.read();
-        if let Some(fp) = fps.get(&req.namespace) {
-            let data = serde_json::to_string(fp).unwrap_or_default();
+        let data = state.env_fingerprints.read_with(|fps| {
+            fps.get(&req.namespace).cloned()
+        });
+        if let Some(fp) = data {
+            let data = serde_json::to_string(&fp).unwrap_or_default();
             Ok(data.to_string())
         } else {
             Ok("{}".to_string())
@@ -164,3 +166,4 @@ impl McpTool for GetEnvironmentDetailsHandler {
 }
 
 
+