{"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-w4z0ehyi","versions":[{"created_at":"2026-06-10T22:52:36Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"ddd9772dfb9b1cb9fa89df28c9e397e1c5243565f1140a041d6da0af981e1040","version":18},{"created_at":"2026-06-10T14:13:33Z","element_count":72,"note":"5軸GA polish 50->96 by M5 (autonomous)","saved_by":"mcp","sha256":"1ceaffa6812a2a7716ef00e8c7fa28bf98dd679175dc1bd4c9a410f83f3db2eb","version":7},{"created_at":"2026-06-10T13:47:17Z","element_count":50,"note":"backfill: 延床=居室床スラブ実面積74.1㎡(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":"432455bf952dddbd9534f027893a9dae26e84f974e29ffb8376686807060f90b","version":4}]}