Coding Plan's /models returns Ark's general catalog, while Agent Plan's returns 404. Skip their model-list requests and ignore old fetched lists, including their protocol and key restrictions. Pay-as-you-go and an explicit list URL still fetch normally; saved model choices stay intact. Both plan endpoints were checked with real keys. TestVolcengineModelLists fails without the no-list behavior and passes with it. Vet (gtk3) and Linux GUI/CLI and Windows builds pass under a temporary HOME. The full nogui suite passes except TestCodexArchivedSameSizeRewriteInvalidatesDiscovery in sessions, also reproduced separately with -race -count=20. Amp-Thread-ID: https://ampcode.com/threads/T-01a11791-db8b-7229-ade8-5e3600b835fc Co-authored-by: Amp <amp@ampcode.com>