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P78(夜晚氛围与场景细节)证据分析 — 真实 Desktop xvfb 1280x720,同日同机位 正午 vs 22 时
近黑阈值 24;实心块 = 24x24 全近黑。

day lantern=0.00(须 0.00)
night glint stripe=141.2 ctl_mean=77.6 ctl_std=4.4 delta=63.5
water bbox std: day=24.0 night=33.9
night near-black frac=0.007 max24blk=184
smoke region mean: day=100.6 night=143.8 delta=43.2 smoke_alpha=182
bridge ring diff: day=-5.7 night=13.5
day vs night differing_pixels=921600

verdict=PASS
  夜帧光斑对比/非光斑平整、水面层次不低于白天、无铁板一块;
  炊烟夜帧更醒目、桥头窄光晕仅夜帧出现;白天 lantern=0 且两帧有差异。