feat(levels): gate the dead turn, and state the curve instead of hoping for it

Round 1 played all fifty levels and came back with the mechanics clean and one
complaint repeated across the reports: 短暂以为转错了方向 — a turn that changed
nothing. That one is mechanical rather than perceptual, so it can be gated.

The first attempt gated `doubleDead`, and it was wrong. That counts dead states,
which scales with the state space: three-turn levels have ~187 reachable stuck
states and five-turn ones ~739, so a raw count made deep levels look eight times
worse when the rate is 2% against 5%. It would have erased every level past
three turns — the opposite of the brief, where turning is the signature and is
not to be rationed. The gate is `maxDeadTurns`, the longest run of turns before
something opens, at 1: one beat of suspense, then a release. Eleven of the fifty
shipped at 2.

Selection could not express the curve either. Spreading picks evenly over the
ranked pool returns whatever the pool is made of, and the pool is 88%
three-turn, so no weighting moved the distribution off {3: 46}. A quota per
depth states the curve outright, deepest first so the scarce end picks before a
family cap is spent on levels the shallow end has hundreds of.

Same rule bot, both sets: blind rotations 0.24 → 0.12, worst blind streak 4 → 1,
decisions unchanged at 10.3. The same amount to do, half the wasted motion.
Rotation now runs 1.8 / 3.0 / 4.1 across the bands against 1.8 / 3.0 / 3.5.

Verdicts are keyed by the board rather than by its id, because a reselect
re-issues ids from the ordinal and `c50-01-v05` is not the same board before and
after — the review sheet was one reselect away from printing one level's verdict
under another's thumbnail.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/art-directions.js

@@ -94,7 +94,7 @@ export const ART_DIRECTIONS=Object.freeze([
       [[0,2,5,3,1,8,6],[1,0,2,6,3,9,7],[3,6,1,0,4,10,2],[6,0,3,5,2,11,8],[2,5,0,6,1,9,3]],
       ['晨雾蓝灰世界色配奶白卡片，靛蓝、松石与琥珀领色。','杏仁暖砂世界色，朱砂与靛蓝领色，像午后的纸面。','苔原灰绿世界色，紫藤与玫红提亮。','暮砂玫瑰灰世界色，玫红与靛蓝对照。','夜航深蓝灰世界色，奶白卡片像被灯照亮的图。']),
     pigments:makePigments(['#2F5FBF','#C4432F','#1C8378','#7A4EB8','#4A8235','#A8690C','#BF3A6B','#4A6B8A','#B0572F','#357358','#8A5C92','#5A6D7C'],['靛蓝','朱砂','松石','紫藤','苔绿','琥珀','玫红','钢蓝','赤陶','墨绿','藕紫','铁灰']).map(p=>({...p,arrow:'#FFFFFF'}))},
-  {id:'macaron',code:'07',name:'马卡龙',en:'MACARON',tag:'参考 Meowdoku',style:'macaron',accent:'#E07416',paper:'#FBF6F0',journeyWorlds:true,layout:{rotation:'under-board',rim:.40},motion:{intro:720,pop:true,celebrate:720},hud:{level:'关卡',moves:'待解',tutorial:'入门'},
+  {id:'macaron',code:'07',name:'马卡龙',en:'MACARON',tag:'参考 Meowdoku',style:'macaron',accent:'#E07416',paper:'#FBF6F0',journeyWorlds:true,layout:{rotation:'under-board',rim:.40,pad:1.1},motion:{intro:720,pop:true,celebrate:720},hud:{level:'关卡',moves:'待解',tutorial:'入门'},
     description:'奶油色世界上托一张白色软托盘，六角格像带白缝的软糖砖，藕紫轨道压在糖砖上。棋子是糖果色圆角六角，白色贴纸边，粗圆头白箭头。反馈用果糖色说话：路线点亮、糖砖出场、离场撒星。',
     principles:['白托盘加白缝，格与格靠留白分开，不画格线','十二色统一白色粗箭头，与白缝同一套白','状态用颜色和弹跳表达：路线点亮、碰撞橘红、出场从左上角一波弹开'],
     route:{blocked:'#F0663A',hint:'#F7C948'},