{"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-sn3azt3i","versions":[{"created_at":"2026-06-11T01:22:32Z","element_count":90,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"08e2a59ea29082c3ad105fcfdc3a6b35c77413ccaeb9d61c9d700dd442f7c2f6","version":12},{"created_at":"2026-06-10T22:45:38Z","element_count":47,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"600fb5782f50b5efa791a43b39cd33c9e3e0f29beaba07db36e9d6663e490d80","version":2}]}