{"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-95dd95xm","versions":[{"created_at":"2026-06-11T01:38:58Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"1955ee884094ab52e24502cf8bc01d127dfd97181408ddea47891e0b01fd2688","version":10},{"created_at":"2026-06-10T23:13:15Z","element_count":47,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"780af00e8183a4fc265276a636843441c69723d1aedb53300f8344b4859c006f","version":2}]}