{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-baldonhillhouse-aecb5scl","versions":[{"created_at":"2026-06-10T22:53:32Z","element_count":77,"note":"legacy fix: jpy90050184→quote21306726 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"444df4bb14c2bb9b7f66f01c38fd25641d09b7c8b25e6ff9a962d894de5575da","version":10},{"created_at":"2026-06-10T16:55:14Z","element_count":88,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"614332f087ee03a5a9296d9e588016c1640a68d06fa7df1c990f383d93afb0bc","version":2}]}