{"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-354ips84","versions":[{"created_at":"2026-06-10T14:12:39Z","element_count":89,"note":"5軸GA polish 69->98 by M5 (autonomous)","saved_by":"mcp","sha256":"0658ee4e51c579ef8d20b41b56dd7d30ededcf5b7392c18cd69140dc62645c5b","version":7},{"created_at":"2026-06-10T13:47:20Z","element_count":47,"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":"0b659580f8fdac79bd7feb2a10e925fb857d4b4c0f17f3f36affaa38c6de4eb9","version":4}]}