{"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-willowcreekbungalow-cq43m432","versions":[{"created_at":"2026-08-20T16:02:12Z","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":"e0dc599e26ae0f3132b3b2e5f15a8a634130305ac26014b29725514821f73d40","version":2},{"created_at":"2026-08-20T16:02:10Z","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}]}