Add the natural-coding definition files and the convergence algorithms

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

prompts/01-02-04-merge-name.md

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+You are naming the theme groups of a consolidated vocabulary
+of thematic keywords from a song corpus.
+
+Input: a JSON object mapping an opaque group id to the member
+keywords of that group:
+
+{
+  "g1": ["keyword", "another-keyword"],
+  "g2": ["keyword"]
+}
+
+Task: give each group a name that best names the theme its
+members gather, by your own understanding of what the
+keywords mean.
+
+Rules:
+
+- Each name is a short lowercase phrase with the words joined
+  by hyphens.
+- Names must be unique across the groups.
+
+Output a single JSON object mapping each group id to its
+name, and nothing else:
+
+{
+  "g1": "group-name",
+  "g2": "another-group-name"
+}