{"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-oakfieldbungalow-6vx6k7t6","versions":[{"created_at":"2026-08-14T23:10:59Z","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":"cffcaa5668b553d621b8d0b8b2e07bad444b663c7c81a3d6f68d2534d0c30182","version":2},{"created_at":"2026-08-14T23:10:59Z","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}]}