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/5d-annotate/run1-rescue-177-199/output.jsonl

@@ -0,0 +1,2 @@
+{"id": "song-177", "text": "[\"M1\", \"X2\", \"X4\", \"X5\", \"X8\", \"F14\", \"X16\"]", "stop_reason": "end_turn", "usage": {"cache_creation": {"ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0}, "cache_creation_input_tokens": 0, "cache_read_input_tokens": 0, "inference_geo": "global", "input_tokens": 8900, "output_tokens": 3525, "output_tokens_details": {"thinking_tokens": 3494}, "service_tier": "batch"}}
+{"id": "song-199", "text": "[\"X5\", \"X8\", \"X9\", \"F3\", \"X12\", \"X14\", \"X15\", \"X16\"]", "stop_reason": "end_turn", "usage": {"cache_creation": {"ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0}, "cache_creation_input_tokens": 0, "cache_read_input_tokens": 0, "inference_geo": "global", "input_tokens": 8902, "output_tokens": 8076, "output_tokens_details": {"thinking_tokens": 8041}, "service_tier": "batch"}}