{"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-8yi3lhwh","versions":[{"created_at":"2026-06-10T13:15:58Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積118.8㎡(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":"fe45eb629b6126dd425187083314ed7b66f9c0d5ea25f27c74de2a7efb28f576","version":10},{"created_at":"2026-06-10T09:38:00Z","element_count":91,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"9a2804fd7e527ed9f05d5be08a78c72ed1b7423e3305542e6083cfc1c0bd3fbb","version":2}]}