{"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-wbruib0v","versions":[{"created_at":"2026-06-10T13:13:53Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.0㎡(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":"d0e7500d0db456f72797132275e86e2fbaba136fc20c40270faa7b42474b19e4","version":10},{"created_at":"2026-06-10T09:05:35Z","element_count":74,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"d2e886009c22e3827621eebcc04b74f7cb62b7ec500d64dbc075e771540fff0a","version":2}]}