{"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-sa4039op","versions":[{"created_at":"2026-06-10T13:25:27Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積106.2㎡(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":"619bced34a0b86e63116653bc9d7c3cc9df121abe1159eef5e72b1980286c385","version":11},{"created_at":"2026-06-10T11:09:40Z","element_count":72,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"480a53df922ebb29a2776ed08dfe9ab5ac71a63e6d0da401656ac103eea9ac95","version":4}]}