Space stuck in broken runtime-control state: build succeeds, but Factory reboot returns 503 and restart API fails

Possible related cases: Unresolved 503 error issue (yesterday): https://discuss.huggingface.co/t/space-stuck-on-starting-badge-despite-app-running-fine-on-port-7860/174315 Intentional blocking by HF: https://discuss.huggingface.co/t/restart-error-503-factory-reset-no-rebuild-same-with-other-space/173779