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P47 scene-detail analysis (LV_P47_SHOT=1, leader rework)

1) 倒影:垂直条纹长度 + 相对背景水面的 luma/暖色差
   p47-day: tiles=14 max_vertical_run=3 (required >= 3) luma_delta=+39.70 (required >= 8.0) warm_rb_delta=+180.17 (required >= 20.0)
   p47-night: tiles=14 max_vertical_run=3 (required >= 3) luma_delta=+90.32 (required >= 8.0) warm_rb_delta=+142.39 (required >= 20.0)
   p47-close: tiles=14 max_vertical_run=3 (required >= 3) luma_delta=+39.92 (required >= 8.0) warm_rb_delta=+176.28 (required >= 20.0)

2) 近景屋顶受光面 / 背光面 luma 差
   p47-day: roofs=40 lit=94.83 shadow=43.41 delta=+51.42 (required >= 16.0)
   p47-night: roofs=40 lit=101.48 shadow=67.47 delta=+34.01 (required >= 16.0)
   p47-close: roofs=40 lit=94.97 shadow=43.40 delta=+51.58 (required >= 16.0)

3) 元素数量指标
   reeds=510 floats=64 reflections=22 sources=41 maxstreak=3

4) 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