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/5c-synthesize/run2/meta.json

@@ -0,0 +1,25 @@
+{
+  "script_version": "run_llm.py 3.1.0",
+  "model": "claude-fable-5",
+  "temperature": null,
+  "thinking": null,
+  "max_tokens": 32000,
+  "prompt_path": "../prompts/05-03-synthesize.md",
+  "prompt_sha256": "90ed14f43153fd8184929e80315d660ca8516466bffa857e669bb2985829a365",
+  "input_path": "instance/llm-input-synthesize-male.jsonl",
+  "input_sha256": "aa0848e7a33e1c579ff3edfc60f3df8c62d15ef2e1464dfc20b4f5acd8ee9a17",
+  "item_count": 1,
+  "dry_run": false,
+  "started_at": "2026-08-15T17:12:34+08:00",
+  "batch": {
+    "batch_id": "msgbatch_01FKqq8U6m5HLLsx7KpQES26",
+    "submitted_at": "2026-08-15T17:12:35+08:00",
+    "ended_at": "2026-08-15T09:15:03.223864+00:00"
+  },
+  "usage": {
+    "cache_creation_input_tokens": 0,
+    "cache_read_input_tokens": 0,
+    "input_tokens": 13573,
+    "output_tokens": 6883
+  }
+}