[错误] sys_list_models 无论配置如何,都报告 antigravity-native 没有可用的模型提供程序

This is the same class of false negative as #2236 and #998 (cli-config / Cursor-native), which were fixed by short-circuiting CLI-login harnesses to a subscription-style readout. `agy` has the same shape — it brings its own Google OAuth login, so there is no omnigent-side provider to resolve — but it was not covered by that fix.