{"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-hd4zw8xd","versions":[{"created_at":"2026-06-10T13:19:15Z","element_count":65,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(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":"0e5edb272271db0f323dcf645456a84432be5ee13ca59967aa54baa63b99e84a","version":10},{"created_at":"2026-06-10T10:09:51Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"14b610871379661980621e903e0238bdff9deafbfcac2aaa5bf5996b10f9fb45","version":2}]}