feat: surface codex windows sandbox progress

tests/fixtures/codex-app-server-runtime.mjs

@@ -519,6 +519,14 @@ rl.on("line", (line) => {
           environmentId: "env-prod",
         },
       });
+      send({
+        method: "windowsSandbox/setupCompleted",
+        params: {
+          mode: "elevated",
+          success: false,
+          error: "token=sk-secret-should-not-leak failed in C:\\Users\\kris\\secret",
+        },
+      });
     }
     if (process.env.BOSS_CODEX_APP_SERVER_FIXTURE_EMIT_THREAD_CONFIG_EVENTS === "1") {
       send({