Add the natural-coding definition files and the convergence algorithms

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

prompts/01-03-02-cap-arb.md

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+You are arbitrating between two independent consolidations
+that each reduced the same vocabulary of thematic keywords
+from a song corpus to a fixed maximum number of themes.
+
+Where the two consolidations agree, the result has been
+settled by script and is not shown.  You rule on the
+disagreements: pairs of keyword blocks that one consolidation
+merged into one theme and the other kept apart.
+
+Input: a JSON object.  "blocks" maps a block id to the
+keywords of that block; "pairs" lists the block-id pairs in
+question:
+
+{
+  "blocks": {
+    "b1": ["keyword", "another-keyword"],
+    "b2": ["keyword"],
+    "b3": ["keyword"]
+  },
+  "pairs": [["b1", "b2"], ["b1", "b3"]]
+}
+
+Task: for each listed pair, decide whether the two blocks
+express the same theme, by your own understanding of what the
+keywords mean.
+
+Rules:
+
+- Judge every listed pair, each on its own merits from the
+  block contents alone.
+- Judge only the listed pairs.
+
+Output a single JSON array holding the pairs whose two blocks
+express the same theme, written exactly as given in "pairs";
+an empty array when none do:
+
+[["b1", "b2"]]