{"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-06gy9jqx","versions":[{"created_at":"2026-06-10T13:10:45Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.0㎡(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":"d0e7500d0db456f72797132275e86e2fbaba136fc20c40270faa7b42474b19e4","version":11},{"created_at":"2026-06-10T08:15:20Z","element_count":85,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ef8c4d982d2aec0b3ad45a2a89abcefc7bede32c1412b1824d7ad219bb7fa3e3","version":2}]}