{"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-grasvenorhouse-pzpz4vsv","versions":[{"created_at":"2026-06-10T13:20:08Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積74.1㎡(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":"d644fde2885decc44afb827cdaebdf59663253f1c60374de245be308adde0d1f","version":10},{"created_at":"2026-06-10T10:23:16Z","element_count":72,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"96f9255adc770308e69b6bc5a8470d5a00bec4b6ff597d31ff5ae959b9953a86","version":2}]}