{"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-highstreethouse-z8k16h4n","versions":[{"created_at":"2026-06-10T13:11:29Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積97.8㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"a2478581aff8dc92a75ae448d130ad79ff6ffe7eb66c35485b313da23e66360e","version":11},{"created_at":"2026-06-10T08:22:34Z","element_count":90,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"91d880550c82cb12070c8ecfb7db871015a1afa18954221cb370205d4a13cc52","version":2}]}