{"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-b5arxllm","versions":[{"created_at":"2026-07-27T02:00:06Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"bac5c734342a367a24fc98640eb0a8fb2e4b6bc21fa3b57b178d5d2cbafca756","version":2},{"created_at":"2026-07-27T02:00:04Z","element_count":90,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}