{"mode":"fallback","providersConfigured":[],"providersAvailable":["groq","cerebras","sambanova","openrouter","mistral"],"note":"No providers configured — verifier returns Phase 0 'pending' fallback. Set any of: GROQ_API_KEY, CEREBRAS_API_KEY, SAMBANOVA_API_KEY, OPENROUTER_API_KEY, MISTRAL_API_KEY"}