{"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-athiiixz","versions":[{"created_at":"2026-06-10T13:16:04Z","element_count":63,"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":"459fd33b651c30d744d2adec9ea40045a83610a0e2cf1b92b47e4e08ee7414ab","version":10},{"created_at":"2026-06-10T09:37:44Z","element_count":91,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"959839f2f98505f6cad00157d938cd44fbf8f7188f778269d66ba4fc5062a0ef","version":2}]}