{"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-zxwt94eo","versions":[{"created_at":"2026-07-28T06:45:07Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"709c0027e07a869c3a2a984ff2044851584b2ebf4cbc9a39d7f983afd514c3f1","version":2},{"created_at":"2026-07-28T06:45:07Z","element_count":105,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}