{"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-ux9t31l5","versions":[{"created_at":"2026-06-11T00:48:22Z","element_count":90,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"08e2a59ea29082c3ad105fcfdc3a6b35c77413ccaeb9d61c9d700dd442f7c2f6","version":15},{"created_at":"2026-06-10T21:55:41Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8188b7e2a9d398b0e569e8d9e9cdf3675cfb2a72229a984b8c9d5d77a217cb79","version":2}]}