feat(balance): Package B 七轮数值优化+关卡成长×永久成长对齿批——worktree adventure-mc-playtest 落籍

- Package B 迭代七轮：enemy HP 阶梯重锚+阶段拔高（L2/L3 14 行+伤害轴 atk 3）、AP 6→8、
  clear_blast 26/18/35→32/24/40、heal_minor 加强、hero max_hp 20、d3 缩板 10×10（板随战斗时长配）
- 数值设计批（game-balancer 工作流）：关卡怪物成长×永久锻造对齿，forge base_price 10→20
- 三阶段快照验证（report_M0/M1/M2）：墙真实存在、锻造单调开门，拍板 B 接受现曲线
- 详见 qa-data/iteration_log.md（九段台账）与 数值设计_关卡成长×永久成长_v1.md
- smoke 工具入库：adventure_monte_carlo.gd / calibrate_boards.gd；qa-data 原始 fulllog 不入库

qa-data/board_calibration.csv

@@ -0,0 +1,20 @@
+level,depth,w,h,n,mines_mean,mines_med,safe_mean,safe_med,r0_mean,inf_mean
+1,0,10,10,200,12.9,13,87.1,87,68.6,0.976
+1,1,10,10,200,12.9,13,87.1,87,68.6,0.976
+1,2,12,12,200,22.6,23,121.4,121,83.2,0.960
+1,3,10,10,200,12.9,13,87.1,87,68.6,0.976
+1,4,12,12,200,22.6,23,121.4,121,83.2,0.960
+2,0,12,12,200,22.6,23,121.4,121,83.2,0.960
+2,1,12,12,200,22.6,23,121.4,121,83.2,0.960
+2,4,12,12,200,22.6,23,121.4,121,83.2,0.960
+2,5,12,12,200,22.6,23,121.4,121,83.2,0.960
+2,6,12,12,200,22.6,23,121.4,121,83.2,0.960
+2,7,12,12,200,22.6,23,121.4,121,83.2,0.960
+2,9,12,12,200,22.6,23,121.4,121,83.2,0.960
+3,0,13,13,200,27.5,28,141.5,141,91.1,0.950
+3,1,13,13,200,27.5,28,141.5,141,91.1,0.950
+3,4,13,13,200,27.5,28,141.5,141,91.1,0.950
+3,5,13,13,200,27.5,28,141.5,141,91.1,0.950
+3,6,13,13,200,27.5,28,141.5,141,91.1,0.950
+3,7,13,13,200,27.5,28,141.5,141,91.1,0.950
+3,9,14,14,200,34.5,35,161.5,161,92.5,0.941