{"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-hilltophaven-a33vu99c","versions":[{"created_at":"2026-08-17T21:17:33Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"b5d1a969035e6d3251507f720bc7f8ddb14a67b07d9f3c052a6f41546abe25cf","version":2},{"created_at":"2026-08-17T21:17:29Z","element_count":107,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}