{"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-1a6uz88w","versions":[{"created_at":"2026-06-13T17:09:14Z","element_count":69,"note":"5軸GA polish 44->93 by M5 (autonomous)","saved_by":"mcp","sha256":"5d81b35c036c0081a91e06900cb4339eb6af9892e52013a8158efb536682689b","version":3},{"created_at":"2026-06-13T17:01:53Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"59ad0f0fe7865eabf9093f4d7444f22765155d4b3830c48bfa2fd60a2be2c33b","version":2},{"created_at":"2026-06-13T17:01:49Z","element_count":86,"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}]}