{"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-qb4bhpds","versions":[{"created_at":"2026-06-10T13:16:19Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積87.5㎡(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":"98a194aeaf498b958603c17fa0719e363361d8ed11502fa338bd946d1765e24c","version":10},{"created_at":"2026-06-10T09:37:53Z","element_count":84,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"f704b1e77f5ccf033503d78cbf5e806a122b48d05dec7ba96bb733733ca3e638","version":2}]}