{"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-d3cdszpb","versions":[{"created_at":"2026-06-10T13:56:53Z","element_count":83,"note":"5軸GA polish 67->98 by M5 (autonomous)","saved_by":"mcp","sha256":"001412c569982d3d67b4c074773fa7ac57bf771553495bdda2db7e882d041f07","version":6},{"created_at":"2026-06-10T13:45:33Z","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":"319c9b396f56dfcc96bd3424552ed4b95b379a6d56611105fa57f22991d14910","version":5}]}