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1ec1f6a68a
Two bugs in the model fallback system: 1. Nous login leaves stale model in config (provider=nous, model=opus from previous OpenRouter setup). Fixed by deferring the config.yaml provider write until AFTER model selection completes, and passing the selected model atomically via _update_config_for_provider's default_model parameter. Previously, _update_config_for_provider was called before model selection — if selection failed (free tier, no models, exception), config stayed as nous+opus permanently. 2. Codex/stale providers in auxiliary fallback can't connect but block the auto-detection chain. Added _is_connection_error() detection (APIConnectionError, APITimeoutError, DNS failures, connection refused) alongside the existing _is_payment_error() check in call_llm(). When a provider endpoint is unreachable, the system now falls back to the next available provider instead of crashing.