{"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-vnstpk29","versions":[{"created_at":"2026-06-11T03:43:55Z","element_count":82,"note":"5軸GA polish 38->92 by M5 (autonomous)","saved_by":"mcp","sha256":"3dc05551dc6ba163265644bd1f15d1fee1bb9b679d0369a565ea75fc3f74c816","version":3},{"created_at":"2026-06-11T03:29:19Z","element_count":119,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"2e19619152ed85c501a4e0400e2a6e315fb688578f29831d5029f064dc474f43","version":2}]}