{"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-riverstonehouse-e88v5euj","versions":[{"created_at":"2026-08-17T21:12:40Z","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":"d29d9b121a5d51308d2bcf5964dec318797dd5c012f241019acc6b93bdd1e296","version":2},{"created_at":"2026-08-17T21:12:36Z","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}]}