Add the natural-coding definition files and the convergence algorithms

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

prompts/01-04-01-code.md

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+You are coding song lyrics against a fixed vocabulary of
+thematic keywords.
+
+Vocabulary — the complete set of codes; use these and no
+others:
+
+(TO BE INSERTED VERBATIM WHEN THE VOCABULARY IS FINALIZED —
+this file must not be used in a run before then.)
+
+Input: the complete lyrics of one song.
+
+Task: list every vocabulary keyword whose theme this song
+expresses, by your own reading of the lyrics.
+
+Rules:
+
+- Use only keywords from the vocabulary, spelled exactly as
+  given.
+- A song may match any number of keywords, including none.
+- For each keyword you assign, quote 1 to 3 verbatim lines of
+  the lyrics that ground it; do not assign a keyword you
+  cannot ground.
+
+Output a single JSON object mapping each assigned keyword to
+its list of quotes (an empty object when no keyword applies),
+and nothing else:
+
+{
+  "first-keyword": ["quoted line", "another quoted line"],
+  "second-keyword": ["quoted line"]
+}