Add the natural-coding definition files and the convergence algorithms

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

prompts/02-01-02-screen-arb.md

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+You are arbitrating a screening of song lyrics for one
+specific theme: two independent screenings of the same song
+disagreed on whether it expresses the theme
+"women-power".
+
+Input: a JSON object with the lyrics of the song and the
+lyric quotes that the affirming screening gave as evidence:
+
+{
+  "lyrics": "...",
+  "evidence": ["quoted line", "another quoted line"]
+}
+
+Task: decide whether the song expresses the theme, by your
+own understanding of the label, reading the lyrics and the
+quoted evidence.
+
+Rules:
+
+- If the song expresses the theme, quote 1 to 3 verbatim
+  lines of the lyrics that ground the judgment; if you cannot
+  ground it in a quote, the answer is no.
+
+Output a single JSON array and nothing else: the quoted
+lines when the song expresses the theme, or an empty array
+when it does not:
+
+["quoted line", "another quoted line"]