{"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-yddr7vo7","versions":[{"created_at":"2026-06-11T01:22:06Z","element_count":91,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"aacf1af454c9ee5ac1ef592ae4afaf4e7bfe1cb24bc448b3e64aa309679b3895","version":11},{"created_at":"2026-06-10T22:52:02Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"7e897231b8880248ee3d6ef58efb8a1d1164c96cc18b4a929a8d79145d735420","version":2}]}