{"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-e4ypnd0n","versions":[{"created_at":"2026-06-10T13:55:42Z","element_count":73,"note":"5軸GA polish 67->97 by M5 (autonomous)","saved_by":"mcp","sha256":"7b06c20c8147415b5ae27362fb04b6b1a52515c362fc422fa1b6bb5952914ba3","version":5},{"created_at":"2026-06-10T13:46:28Z","element_count":50,"note":"backfill: 延床=居室床スラブ実面積74.1㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"432455bf952dddbd9534f027893a9dae26e84f974e29ffb8376686807060f90b","version":4}]}