{"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-935zv5uu","versions":[{"created_at":"2026-07-25T18:29:21Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"345129dfa3de43d8c6713b8e5d54b4c6b6d3ed20cf19b59997244204d530166d","version":2},{"created_at":"2026-07-25T18:29:17Z","element_count":107,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}