{"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-t45wjzzr","versions":[{"created_at":"2026-06-10T13:23:36Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.7㎡(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":"69c855550dc4f95c45cb4db404c8fc5e9985359113267fd75e07329629c229e4","version":10},{"created_at":"2026-06-10T10:37:46Z","element_count":83,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"bee432f3a6ff08d553bc62991069c632f33bd33f9dbea2a3cb1d8298aa045587","version":2}]}