Quote one line per kept keyword in the arbitration

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/decision-log.md

@@ -517,3 +517,14 @@
   的第二道工序；`arb` 又是全部 task 名中唯一的縮寫。趁
   步驟 3-2 尚未執行改名，此名進歸檔目錄與論文引用後即
   不再變動。
+- **仲裁的輸出格式要求連帶改變裁決本身，據實記入論文
+  限制**：步驟 3-2 首次執行，644 首中 2 首遭輸出過濾
+  攔阻、13 首輸出夾帶散文——thinking 關閉，模型把推理
+  寫進可見輸出，其中可見「Wait, let me reconsider.」的
+  自我否定。定義檔補上「每個保留的碼恰引一行」與「JSON
+  之外不得書寫任何文字」後以同一份輸入重跑（SHA-256 未
+  變），攔阻與散文皆歸零，但保留率同時由 80.1%
+  （1,342／1,676）升至 87.2%（1,481／1,699；分母差異來自
+  首次執行有 2 首無輸出）。即：禁止在輸出裏推理不只改變
+  格式，也改變了裁決——少了邊寫邊自我否定的過程，模型
+  傾向保留。此為儀器行為的一部分，不作修補。

docs/run-costs.md

@@ -36,5 +36,6 @@ $3／$15、opus-4-6 $5／$25、opus-5 與 fable-5 $10／$50）
 | 2026-08-06 | 命名實驗（100 組）| — | claude-fable-5 | msgbatch_01Y8SJj1h1ZuSQRErhqkvgZE | 3 分 2 秒 | 76,211 | 2,049 | $0.43 | 實驗：同上，加禁用 themes；未採用；歸檔不入 repo |
 | 2026-08-06 | 03-01-code | run1 | claude-sonnet-4-6 | msgbatch_01GS1opvurvsf62oknnQxhtx | 3 分 46 秒 | 1,625,458 | 362,759 | $5.16 | 現行（101 碼；883 首全數有效，零攔阻） |
 | 2026-08-06 | 03-01-code | run2 | claude-sonnet-4-6 | msgbatch_01CxnwNLWzZbRpZK7UAdpb8i | 5 分 22 秒 | 1,625,458 | 364,098 | $5.17 | 現行（101 碼；883 首全數有效，零攔阻） |
+| 2026-08-06 | 03-02-arbitration | — | claude-sonnet-4-6 | msgbatch_019xcQXwrbwDGFc9nE5M8AjE | 4 分 0 秒 | 763,193 | 42,389 | $1.46 | 已取代（2 首遭內容過濾攔阻、13 首輸出夾帶散文；定義檔修訂後重跑） |
 
-累計支出：$55.12。
+累計支出：$56.58。

prompts/03-02-arbitration.md

@@ -7,14 +7,14 @@ disagreements: the keywords assigned by one coding but not
 the other.
 
 Input: a JSON object with the lyrics of the song and the
-disagreements — each disagreement maps a keyword to the lyric
+disagreements — each disagreement maps a keyword to the
-quotes the assigning coding gave as evidence:
+quoted lyric line the assigning coding gave as evidence:
 
 {
   "lyrics": "...",
   "disagreements": {
-    "first-keyword": ["quoted line", "another quoted line"],
+    "first-keyword": ["quoted line"],
-    "second-keyword": ["quoted line"]
+    "second-keyword": ["another quoted line"]
   }
 }
 
@@ -25,18 +25,21 @@ of the quoted evidence.
 Rules:
 
 - Rule on every listed keyword: keep it or drop it.
-- Keep a keyword only when you can ground it in verbatim
+- For each keyword you keep, quote exactly one verbatim line
-  lines of the lyrics; quote them.
+  of the lyrics that grounds it; drop a keyword you cannot
+  ground.
 - Do not add any keyword that is not listed.
 
 Do not wrap the output in a Markdown code fence.
 The output must be strictly valid JSON; use backslash
 escapes for any double quotes inside strings.
+Write nothing outside the JSON object — no explanation, no
+reasoning, no commentary, before it or after it.
 
-Output a single JSON object mapping each kept keyword to your
+Output a single JSON object mapping each kept keyword to its
 list of quotes, and nothing else.  A dropped keyword is simply
 left out; output an empty object when nothing is kept:
 
 {
-  "kept-keyword": ["quoted line", "another quoted line"]
+  "first-keyword": ["quoted line"]
 }