{"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-y1xmlqdg","versions":[{"created_at":"2026-06-30T08:03:20Z","element_count":90,"note":"5軸GA polish 38->91 by M5 (autonomous)","saved_by":"mcp","sha256":"78a5a215140efa44c91e487238e954676af1973d2379995b042f933a35faf79c","version":3},{"created_at":"2026-06-30T07:57:02Z","element_count":101,"note":"loop3: 設計時延床 48.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"aa5d70ee284306cbace735c875610f318acf08cd20a190be9bb5ec9821864b6b","version":2},{"created_at":"2026-06-30T07:57:01Z","element_count":101,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}