Rebuild the vocabulary step on embeddings and drop the screen track

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

prompts/03-02-code-arb.md

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+You are arbitrating between two independent codings of the
+same song against the same fixed vocabulary of thematic
+keywords.
+
+The keywords the two codings agree on have been settled by
+script and are not shown.  You rule only on the
+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:
+
+{
+  "lyrics": "...",
+  "disagreements": {
+    "first-keyword": ["quoted line", "another quoted line"],
+    "second-keyword": ["quoted line"]
+  }
+}
+
+Task: for each disagreement keyword, decide whether the song
+expresses that theme, by your own reading of the lyrics and
+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.
+- 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.
+
+Output a single JSON object mapping each kept keyword to your
+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"]
+}