docs(levels): report what round 2 measured, including the number it overturns

The round accidentally ran every level twice, which turned into the most useful
thing it produced: 45 retest pairs on this exact set. 84% of them replayed the
identical action sequence, so the agent is near-deterministic and a second run
of a level buys almost nothing — the mechanical metrics retest at r = 1.00 for
that reason, not because they survived a hard test.

The ratings do not. Difficulty retests at r = 0.55 here, against the 0.93 this
project had on record from a smaller sample, and every pair that disagreed had
played the same trajectory: same moves, same outcome, different number. The
report now prints the reliability it measured rather than quoting the older
figure, and says which one it replaces.

Averaged by band over ~20 runs, though, the ratings finally track the curve —
2.00 / 2.05 / 2.40 with stuck at 1.21 / 1.15 / 1.74, where round 1 was a flat
line. So the rule is not "ratings are useless", it is "ratings are a band
statistic, never a per-level rank", and that is what the rules section says.

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

bench/board.json

@@ -1,7 +1,7 @@
 {
  "goal": "调出 50 关难度合适、好玩的关卡，交付人工审核",
  "updated": "09-14 16:45",
- "round": 1,
+ "round": 2,
  "definition": {
   "title": "「难度合适且好玩」的操作定义",
   "why": "旋转是免费的、是这个游戏的特色，玩家应该频繁做——所以不该限制旋转次数。该限制的是每一次旋转值不值：转了有没有棋子出来、能不能看出来该转哪、以及转完之后有没有「原来这么简单」的反差。评分里只有 difficulty（复测 r=0.93）和 stuck（r=0.85）可信，rotation / clarity / fun 是噪声（0.32 / 0.19 / 0.56），所以「好玩」全部换成机械代理。 另外，演出本身就是奖励——棋子沿弯路走出去的那几秒是减压点，所以开局必须有得看，而不是只有两枚贴边棋子和 0.3 秒。",
@@ -124,14 +124,14 @@
     {
      "id": "T1.5",
      "title": "扩产到 ≥120 候选并去重、家族均衡",
-     "status": "doing",
-     "note": "扩产到 400 种子（8 片并行）。目的不是多，是为了付得起两道新闸门的代价：双向死转态 ≤2 只留 16%，在 94 个候选上会只剩 8 关"
+     "status": "done",
+     "note": "扫了 480 + 240 个种子，得 684 个候选；过两道新闸门后 228 关。扩产的目的是付得起闸门的代价，不是数量本身"
     },
     {
      "id": "T1.6",
      "title": "终局三枚互锁（hero+gate+tail）",
      "status": "blocked",
-     "note": "深关卡的主要死因：5 转以上有 60% 死在「终局单出口」。实测终局是锁链自己的三枚棋子在 6 个朝向里堵死 5 个。双向释放约束只覆盖了 hero/tail 两枚，三枚组合覆盖不到——这是可达状态的性质，构造时难保证。当前对策是提高扫描量靠筛选拿到，不是修构造"
+     "note": "仍是深关卡的瓶颈：684 个候选里深度≥4 的只有 67 个，过闸门后剩 16 个——后档只能做到平均 4.1 转，是供给限制不是设计选择"
     },
     {
      "id": "T1.7",
@@ -184,18 +184,20 @@
     {
      "id": "T3.2",
      "title": "按实测曲线调整选关，重选",
-     "status": "doing",
-     "note": "R1 唯一可用的是总体读数「偏易」，不是逐关排名。据此定的 R2 改动只有一条、且是机械可测的：给 doubleDead（左右转都打不开任何棋子的可达卡住态）设闸门——它此前完全没设，当前 50 关中位 4、最高 27。这正是用户说的「无效转动就会很无聊」，也是 agent 后段反复写的「短暂以为转错了方向」"
+     "status": "done",
+     "note": "连续空转设闸门（≤1）+ 难度曲线改为按旋转深度配额。同一规则机器人对照：盲转 0.24→0.12，最长连续盲转 4→1，决策数不变"
     },
     {
      "id": "T3.3",
      "title": "第 2 轮验证",
-     "status": "todo"
+     "status": "done",
+     "note": "R2：99 局覆盖 50 关，全部通关，空点 0。难度按档 2.00 / 2.05 / 2.40，无解感 1.21 / 1.15 / 1.74 —— 评分第一次出现梯度"
     },
     {
      "id": "T3.4",
      "title": "收敛判定（难度曲线单调、stuck 达标）",
-     "status": "todo"
+     "status": "doing",
+     "note": "机械面已收敛：空点 0、不可解态 0、连续空转≤1、终局朝向≥3。难度未达标：后档 2.40 vs 目标 3。瓶颈是深关卡供给（见 T1.6），正在扫第二批种子。注意逐关评分复测 r=0.55 且同轨迹会打出不同分，只有按档≈20 局才可读"
     }
    ]
   },
@@ -206,7 +208,8 @@
     {
      "id": "T4.1",
      "title": "50 关关卡集",
-     "status": "todo"
+     "status": "done",
+     "note": "levels/campaign-50.json + src/levels-c50.js，已注册为可玩版本 c50，198 项测试全绿"
     },
     {
      "id": "T4.2",
@@ -217,7 +220,8 @@
     {
      "id": "T4.3",
      "title": "后续关卡制作流程的优化总结",
-     "status": "todo"
+     "status": "done",
+     "note": "docs/level-process.html：两轮对照、复测可信度表（本批现算）、五条规则各带证据、被否掉的做法清单"
     }
    ]
   }
@@ -251,6 +255,10 @@
   {
    "at": "R2 依据",
    "text": "后段 14 条抱怨里两类：路线太长（感知，已对照 v0.5 基线否掉）与「转了没反应」（机械，可设闸门）。只改后者：endgameMinOpen 2→3、doubleDead 无闸门→≤2。两条合计只留 16% 候选，所以先扩池"
+  },
+  {
+   "at": "R2 结果",
+   "text": "难度评分按档 2.00/2.05/2.40（R1 是三档全平），无解感 1.21/1.15/1.74。意外把每关跑了两次，得到 45 对复测：84% 重放了完全相同的动作序列，机械指标 r=1.00，难度评分 r=0.55——且评分分歧的那几对全是同轨迹。结论：agent 近乎确定性，同一关不必跑两遍"
   }
  ]
 }