{"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-druqkp6r","versions":[{"created_at":"2026-06-10T13:12:10Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.4㎡(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":"824d7985f1bdd0d20074f7a4c9ddc42144d58b4769be5dfb3559d329b8ba00a8","version":11},{"created_at":"2026-06-10T08:32:41Z","element_count":91,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"fe08524333bd732ca0ec9f9d1d0ce8b22320a1396235b44af503cc27cf744894","version":3}]}