Quote one line per kept keyword in the arbitration

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

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
-quotes the assigning coding gave as evidence:
+disagreements — each disagreement maps a keyword to the
+quoted lyric line the assigning coding gave as evidence:
 
 {
   "lyrics": "...",
   "disagreements": {
-    "first-keyword": ["quoted line", "another quoted line"],
-    "second-keyword": ["quoted line"]
+    "first-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
-  lines of the lyrics; quote them.
+- For each keyword you keep, quote exactly one verbatim line
+  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"]
 }