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Démarre un span LLM enfant du tour de conversation actuel. Génère une erreur si aucun tour de conversation n’est
actif.Défini dans : src/genai/api.ts:77
weave.startLLM({model: 'gpt-4o-mini',providerName: 'openai',systemInstructions: ['You are a helpful weather bot.'],startTime: newDate('2026-05-29T10:00:00.000Z'),});