Changed the natural-coding definition files to single-pass convergence

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

prompts/01-02-01-merge.md

@@ -13,11 +13,14 @@ Rules:
 - Do not invent keywords that are not in the input.
 - Merge only what you consider the same theme; a group may be
   a single keyword.
+- Name each group with a short lowercase phrase, words joined
+  by hyphens, that best names the theme it gathers.  Group
+  names must be unique.
 
-Output a single JSON array of groups — each group an array of
-its member keywords — and nothing else:
+Output a single JSON object mapping each group name to the
+list of its member keywords, and nothing else:
 
-[
-  ["keyword", "another-keyword"],
-  ["keyword"]
-]
+{
+  "first-group-name": ["member-keyword", "another-member"],
+  "second-group-name": ["member-keyword"]
+}