Zero-cost OpenRouter responder that auto-discovers the best currently free model, retries on failures, and returns clean answers fast. Use this when a user asks to query OpenRouter, wants lowest-cost/free model routing, or explicitly requests a free-model OpenRouter response.

零成本的OpenRouter响应器，自动发现当前免费的最佳模型，失败时重试，并快速返回简洁答案。当用户要求查询OpenRouter、需要最低成本或免费模型路由，或明确请求免费模型的OpenRouter响应时使用此功能。