{"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-6w6qwlbf","versions":[{"created_at":"2026-06-10T13:24:22Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.4㎡(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":"42953ddb9d392a8e7e67cec89ccfb88678d3f8f3fa6411994638b80566ac7043","version":10},{"created_at":"2026-06-10T10:53:09Z","element_count":84,"note":"5軸GA polish 53->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b514487e951f3ccb2cf3e6b3f6a7634b91c24754b8e2ebdbcedea8f2a95a3e77","version":3}]}