p72: 角色行走四向动画帧提升（6 走 + 2 待机）

CharacterArt 运行时点阵图集从 4 走 + 2 待机扩为 6 走（新增左右低过渡步 4/5，由 1/2 镜像）+ 2 待机，格数 *8、图集 5120x48；VillageArt 帧循环 %6、characterSourceRectangle *8、characterAtlasWidth 5120。同步 P45/Prototype 帧断言、新增 P72 帧表完整性回归、脚本与素材重新生成、维护说明动画语义。白天正午村庄行走实跑证据落 docs/evidence/p72-*。Desktop 343/343、Kernel 120/120、digest 与 p70 一致。

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diff --git a/docs/evidence/p72-analysis.txt b/docs/evidence/p72-analysis.txt
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+P72（角色行走四向 8 帧：6 走 + 2 待机）证据分析 — 真实 Desktop xvfb 1280x720 正午
+钩子：LV_AUTOPLAY_SAMPLE=1 LV_AUTOPLAY_RECORD=1 LV_P72_LOG=1 LV_AUTOPLAY_START_HOUR=12 LV_LEGACY_MAP=1
+路径：world.Tick → rhythmFor → animationFrame((tick/4)%6) → characterSourceRectangle(*8 格) → drawCharacter
+
+recorded frames: 41
+distinct walk frames observed: ['FrameFive', 'FrameFour', 'FrameOne', 'FrameSix', 'FrameThree', 'FrameTwo']
+walk frame exemplars: FrameFive=p72-walk-0492.png(npc0), FrameFour=p72-walk-0264.png(npc0), FrameOne=p72-walk-0276.png(npc0), FrameSix=p72-walk-0132.png(npc0), FrameThree=p72-walk-0120.png(npc0), FrameTwo=p72-walk-0132.png(npc1)
+npcs with observed displacement: 30
+npc0 distinct frames: ['FrameFive', 'FrameFour', 'FrameOne', 'FrameSix', 'FrameThree']
+
+p72-walk-0276.png: size=1280x720 mean=87.2 std=34.8 dark_block=0 white_block=20
+p72-walk-0132.png: size=1280x720 mean=118.5 std=54.2 dark_block=0 white_block=52
+p72-walk-0120.png: size=1280x720 mean=87.1 std=34.5 dark_block=0 white_block=32
+p72-walk-0264.png: size=1280x720 mean=87.1 std=34.9 dark_block=0 white_block=32
+p72-walk-0492.png: size=1280x720 mean=87.3 std=34.9 dark_block=0 white_block=26
+
+diff p72-walk-0276.png vs p72-walk-0132.png: differing_pixels=905924
+diff p72-walk-0276.png vs p72-walk-0120.png: differing_pixels=313725
+diff p72-walk-0276.png vs p72-walk-0264.png: differing_pixels=242017
+diff p72-walk-0276.png vs p72-walk-0492.png: differing_pixels=294080
+diff p72-walk-0132.png vs p72-walk-0120.png: differing_pixels=906006
+diff p72-walk-0132.png vs p72-walk-0264.png: differing_pixels=905936
+diff p72-walk-0132.png vs p72-walk-0492.png: differing_pixels=905931
+diff p72-walk-0120.png vs p72-walk-0264.png: differing_pixels=306092
+diff p72-walk-0120.png vs p72-walk-0492.png: differing_pixels=241732
+diff p72-walk-0264.png vs p72-walk-0492.png: differing_pixels=276242
+
+verdict=PASS
+  all 6 walk frames exercised; npc0 moved through >=4 frames;
+  exemplar frames render 1280x720, no white/black blocks, and differ pairwise.
diff --git a/docs/evidence/p72-walk-framefive.png b/docs/evidence/p72-walk-framefive.png
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diff --git a/docs/evidence/p72-walk-framefour.png b/docs/evidence/p72-walk-framefour.png
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index 0000000..b321bb6
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+++ b/docs/evidence/p72-walk-framefour.png
diff --git a/docs/evidence/p72-walk-frameone.png b/docs/evidence/p72-walk-frameone.png
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index 0000000..c3c1524
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+++ b/docs/evidence/p72-walk-frameone.png
diff --git a/docs/evidence/p72-walk-framesix.png b/docs/evidence/p72-walk-framesix.png
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index 0000000..af5fa25
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+++ b/docs/evidence/p72-walk-framesix.png
diff --git a/docs/evidence/p72-walk-framethree.png b/docs/evidence/p72-walk-framethree.png
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index 0000000..5c32d07
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+++ b/docs/evidence/p72-walk-framethree.png