{"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-house-usqi78aq","versions":[{"created_at":"2026-07-13T19:29:27Z","element_count":89,"note":"5軸GA polish 41->94 by M5 (autonomous)","saved_by":"mcp","sha256":"89fb2242415af01c906491678cea028508d0f8b8d97e33151158c7f0352ed976","version":3},{"created_at":"2026-07-13T19:24:48Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8b78a20ec19a4ad20785059e48e3960b44a177b96109ae9c92736915f0448700","version":2},{"created_at":"2026-07-13T19:24:47Z","element_count":119,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}