{"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-o1kh8dbc","versions":[{"created_at":"2026-06-10T13:13:18Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(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":"8befb85d3a69cb32e024d17c153d6e66b9a780726f2e7bfa6d5416368c13bea0","version":10},{"created_at":"2026-06-10T09:05:43Z","element_count":90,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"416f8ae836439f4fae3c5753635aab0a5bd87c19e8a7160162401ba95f2a3f82","version":2}]}