{"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-ckoqs3m5","versions":[{"created_at":"2026-06-10T13:25:29Z","element_count":63,"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":"663709b027d2fb3d75c07191bccbdef0a08b45641c7d269996e4ec28ebd4ea34","version":11},{"created_at":"2026-06-10T11:09:42Z","element_count":73,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"98e38e5aeefd2b34ee1ff201a92a0db27532aed1578a470ed7ef4ceb06bc47fe","version":4}]}