Renumber the pipeline substeps to match the paper (5-1 becomes 5a)

prompts/ and runs/ move by git mv; zero padding dropped; the
arbitration and LLM-merge rows in the cost ledger carry no new
name -- their step column reads 已廢棄 with the original name
kept in a new last column.  Archived meta.json files and past
decision-log entries keep the names they were written with.

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

runs/2-cluster/meta.json

@@ -0,0 +1,33 @@
+{
+ "script_version": "cluster_keywords.py 1.0.0",
+ "source_runs": [
+  "runs/01-tag/run1",
+  "runs/01-tag/run2"
+ ],
+ "source_records": [
+  882,
+  882
+ ],
+ "embedding": {
+  "model": "sentence-transformers/all-mpnet-base-v2",
+  "revision": "e8c3b32edf5434bc2275fc9bab85f82640a19130"
+ },
+ "clustering": {
+  "algorithm": "AgglomerativeClustering",
+  "linkage": "ward",
+  "metric": "euclidean",
+  "clusters": 100
+ },
+ "extra_keywords": [
+  "women-power"
+ ],
+ "keyword_count": 5999,
+ "versions": {
+  "python": "3.14.6",
+  "torch": "2.13.0+cpu",
+  "transformers": "5.14.1",
+  "sentence-transformers": "5.6.1",
+  "scikit-learn": "1.9.0",
+  "numpy": "2.5.1"
+ }
+}