{"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-theoldmillhouse-7ls4me52","versions":[{"created_at":"2026-06-10T13:23:06Z","element_count":63,"note":"backfill: 延床=居室床スラブ実面積118.8㎡(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":"ca653dfc8ab5e45bd04890c8eb214fb43cc7712ba4f1f320d09a974fee58a635","version":10},{"created_at":"2026-06-10T10:37:36Z","element_count":90,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"3b260ce50954e246f147d7fde84eefd69c058b3f07996dcaea0332eaa9dea5e8","version":2}]}