This patch introduces a new `baibot_conversation_start_time_utc` variable which indicates the time the conversation got started. Using `baibot_now_utc` is still possible, but given that the current time is a moving target, its use is in conflict with prompt caching. Because the new `baibot_conversation_start_time_utc` prompt variable is a more reasonable default, we're now using it in all sample configs.
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401 B