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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=32.3
+night near-black frac=0.007 max24blk=184
+smoke region mean: day=100.6 night=146.8 delta=46.2 smoke_alpha=182
+bridge ring diff: day=-5.7 night=24.5
+day vs night differing_pixels=921599
+
+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。