{"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-5pj74lqn","versions":[{"created_at":"2026-06-30T19:37:02Z","element_count":84,"note":"5軸GA polish 44->95 by M5 (autonomous)","saved_by":"mcp","sha256":"ea6ba8a0c133c0e4907dda40627ab4d070c5f6e0fe3b4177345d78c3165f006f","version":3},{"created_at":"2026-06-30T19:24:16Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8e643379e829d1ac6160aa429f9dca7068cbafcf123e4fcc69fbba3e99e43641","version":2},{"created_at":"2026-06-30T19:24:16Z","element_count":119,"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}]}