fix(commandcode): force stream=true in transformRequest

CommandCode upstream only speaks NDJSON streaming; the executor always
wraps it as OpenAI SSE. Force body.stream=true so non-stream client
requests still produce a parseable upstream stream (router aggregates
SSE→JSON downstream).

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/executors/commandcode.js

@@ -19,6 +19,11 @@ export class CommandCodeExecutor extends BaseExecutor {
     super("commandcode", PROVIDERS.commandcode);
   }
 
+  transformRequest(model, body, stream, credentials) {
+    body.stream = true;
+    return body;
+  }
+
   buildHeaders(credentials, stream = true) {
     const headers = {
       "Content-Type": "application/json",