{"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-house-bi9i4l8x","versions":[{"created_at":"2026-06-10T22:59:40Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy40475808→quote24212747 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"619cbfa0066a551f7f5028d7ebe0c4637b7a97eeaaa72874379cdcb782c4b733","version":9},{"created_at":"2026-06-10T20:38:19Z","element_count":83,"note":"5軸GA polish 60->92 by M5 (autonomous)","saved_by":"mcp","sha256":"4393ed26bce3190392bdc851f62dcd47f5f68c013c69d5190a6de75753bc513f","version":2}]}