{"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-ewelmehouse-308gqn0x","versions":[{"created_at":"2026-06-10T13:19:48Z","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":"95a1e2c84e50b5990ad519a19fb2b95cbc3ce04325da63e92b01ffe26a830e73","version":10},{"created_at":"2026-06-10T10:09:07Z","element_count":72,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"791672d0eafb935fff690a21c2728118bb4f887fd18de0a966b496810fa3598e","version":2}]}