fix(types)+docs: referral_champion 时间语义 snapshot→lifetime + 补判别准则
- referral_champion 读 DW recommend_num/amount 全史累计计数器(单调只增)→ lifetime (纯声明字段修正,不影响计算逻辑);提取器头注释同步。 - acquisition_channel 注明"实为 static(不变历史定格),退化场景归 snapshot"。 - 速览文档补 snapshot vs lifetime 判别准则:分界看值的演化方向(lifetime 只增不减 / snapshot 可逆可变),非评估时点;并注明 entitlement_status 是"曾有"非"现有"。 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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