p47: 场景细节升级 — 河道倒影(waterFrameTickAt微抖)+岸边芦苇加密度+鸭/叶漂浮元素+近景屋顶统一光源阴影

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diff --git a/docs/evidence/p47-analysis.txt b/docs/evidence/p47-analysis.txt
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+P47 scene-detail analysis (LV_P47_SHOT=1)
+
+1) 倒影区 luma 相关性 (bank column profile vs vertically-mirrored water band)
+   p47-day: pearson r = 0.299 (required >= 0.2)
+   p47-night: pearson r = 0.322 (required >= 0.2)
+   reflection vs control water luma delta (night) = 54.40 (required >= 10.0)
+
+2) 元素数量指标
+   reeds=510 floats=64 reflections=18 sources=41
+
+3) 无大黑块 / 无白块 / 不透明校验
+   p47-day: alpha_min=255 black_px=0 black_block=None white_block=None
+   p47-night: alpha_min=255 black_px=0 black_block=None white_block=None
+   p47-close: alpha_min=255 black_px=0 black_block=None white_block=None
+
+verdict = PASS
diff --git a/docs/evidence/p47-close.png b/docs/evidence/p47-close.png
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diff --git a/docs/evidence/p47-day.png b/docs/evidence/p47-day.png
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diff --git a/docs/evidence/p47-night.png b/docs/evidence/p47-night.png
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+++ b/docs/evidence/p47-night.png