{"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-88u1bwa4","versions":[{"created_at":"2026-06-11T01:05:17Z","element_count":73,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"3fb41b395ed9dcfe25355bdcf36d8b23f021db1ec462f6e727a6741a4b16f471","version":14},{"created_at":"2026-06-10T22:16:06Z","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":"5254fc336eb7b95435dec76b8de7f8698dcf39ab7aff0a2afa1d23b14644b060","version":2}]}