fix(cli): hide Codex app-server console window on Windows (#574)

Spawn codex with windowsHide on win32 to avoid extra cmd windows
and stray exit code 128 shells when using shell: true.

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

cli/src/codex/codexAppServerClient.ts

@@ -84,7 +84,8 @@ export class CodexAppServerClient {
                 return acc;
             }, {} as Record<string, string>),
             stdio: ['pipe', 'pipe', 'pipe'],
-            shell: process.platform === 'win32'
+            shell: process.platform === 'win32',
+            windowsHide: process.platform === 'win32'
         });
 
         this.process.stdout.setEncoding('utf8');