{"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-willowbrookhouse-cuc3tma0","versions":[{"created_at":"2026-07-31T10:37:51Z","element_count":87,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"57c2335437cccd86a9695d761a0e3ac396a35c42ce26bc7d3030ad0a0a4c5907","version":2},{"created_at":"2026-07-31T10:37:51Z","element_count":87,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}