{"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-0x4rlpoz","versions":[{"created_at":"2026-08-04T06:07:42Z","element_count":85,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"df30255fe07d66b717e362529dfbb8020467917552a5318de148b80cd3ee0d49","version":2},{"created_at":"2026-08-04T06:07:42Z","element_count":85,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}