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根因:_call_nemotron() 直接呼叫 Ollama httpx(settings.OLLAMA_URL)
繞過 AI Router,無 fallback → "All connection attempts failed"
→ Telegram 卡顯示「意圖分析失敗:All connection attempts failed」
修復:改走 get_openclaw().call(prompt)
自動享有 Provider 降級與 fallback 機制(與其他 Agent 一致)
廢棄:BUG-001 httpx 直連繞過法(nvidia_provider 介面已穩定)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>