P75（HUD 顶部条去整宽深色带 → 紧凑半透明药丸）证据分析 — 真实 Desktop xvfb 1280x720
钩子：LV_P43_SHOT=1（同机位昼 12:00 / 夜 23:30）
判据：顶部条 y<36 近黑占比 vs 整宽深色带基线（100%）下降 >90%，文字亮像素仍在

log: p43-shot=p43-hud-day tick=2592000 calendar=1128,47,140,52
log: p43-shot=p43-hud-night tick=5076000 calendar=1128,47,140,52

p43-hud-day.png: size=1280x720 strip_dark_px=1205/46080 dark_frac=0.026 drop_vs_full_band=97.4% dark_block_24=160 bright_px=1570
p43-hud-night.png: size=1280x720 strip_dark_px=1262/46080 dark_frac=0.027 drop_vs_full_band=97.3% dark_block_24=152 bright_px=1163

diff p43-hud-day vs p43-hud-night: differing_pixels=921386

verdict=PASS
  baseline full-width dark band = 46080 px (frac 1.000).
  both strips are mostly scene/pill, no near-black block, and text/icons remain bright.