{"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-1uf09mys","versions":[{"created_at":"2026-06-11T01:38:48Z","element_count":89,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5d9ce898e0fd6a68d57c46d905bcb59f80795b39fad45ffe6422afa30fbae50e","version":9},{"created_at":"2026-06-10T23:22:23Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"90e478f0c3ae8590bdc720963c8cde21a4ee979ba3ea1e825b2bd16a1260ce79","version":2}]}