{"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-4u2zmc2d","versions":[{"created_at":"2026-06-11T01:38:57Z","element_count":71,"note":"5軸GA polish 44->95 by M5 (autonomous)","saved_by":"mcp","sha256":"5f0a8ee7286b6050be65939cb8a4a3d8ebd07cb399393c3908f3840b8f8e1128","version":10},{"created_at":"2026-06-10T23:18:02Z","element_count":54,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"89ead6a9ca77024ab76da9520547a35717f7574b6fe074e5ab987d7710cb2f89","version":2}]}