test: Fix broken mcp-stdio module imports in unit tests

nvim-core/src/lib.rs

@@ -836,7 +836,8 @@ mod tests {
     async fn test_read_message_jsonl() {
         let input = "{\"jsonrpc\": \"2.0\", \"id\": 1, \"method\": \"test\"}\n";
         let mut reader = BufReader::new(input.as_bytes());
-        let req = read_message(&mut reader).await.unwrap();
+        let raw = mcp_stdio::read_mcp_message(&mut reader).await.unwrap();
+        let req: JsonRpcRequest = serde_json::from_str(&raw).unwrap();
         assert_eq!(req.method, "test");
     }
 
@@ -845,7 +846,8 @@ mod tests {
         let payload = "{\"jsonrpc\": \"2.0\", \"id\": 2, \"method\": \"test2\"}";
         let input = format!("Content-Length: {}\r\n\r\n{}", payload.len(), payload);
         let mut reader = BufReader::new(input.as_bytes());
-        let req = read_message(&mut reader).await.unwrap();
+        let raw = mcp_stdio::read_mcp_message(&mut reader).await.unwrap();
+        let req: JsonRpcRequest = serde_json::from_str(&raw).unwrap();
         assert_eq!(req.method, "test2");
     }
 
@@ -853,7 +855,7 @@ mod tests {
     async fn test_read_message_malformed() {
         let input = "Content-Length: abc\r\n\r\n{}";
         let mut reader = BufReader::new(input.as_bytes());
-        let req = read_message(&mut reader).await;
+        let req = mcp_stdio::read_mcp_message(&mut reader).await;
         assert!(req.is_none());
     }
 }