{"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-t1hrrjnb","versions":[{"created_at":"2026-06-11T01:21:56Z","element_count":74,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"826965f5c8ec939017654c345ce04ae90ec74183a9158699fce4ce3fae520fba","version":12},{"created_at":"2026-06-10T22:50:34Z","element_count":46,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ff41eaaed5ec151ca1e4434796db771a5d7b3aadf52a1534567c17c9fa686c36","version":2}]}