{"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-s3ee0ifx","versions":[{"created_at":"2026-06-13T16:29:22Z","element_count":90,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"b79f7ff6d8e2d5e0b2fbce896979145219c8e8d9c0837bfac181021f400ad82b","version":3},{"created_at":"2026-06-13T16:20:03Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1c731b5a06c6c08143251527ebab8ae1e593b0d8403c3a46be24f5908346119c","version":2},{"created_at":"2026-06-13T16:20:01Z","element_count":105,"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}]}