{"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-hamiltonviewcottage-vq3awzsm","versions":[{"created_at":"2026-06-10T13:22:57Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積92.5㎡(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":"1d9a1be1afd03a1ad33c31335d8f50d77b168e3c5b367108f4496629318d7fe1","version":10},{"created_at":"2026-06-10T10:37:43Z","element_count":91,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"a4e3183672b418aa7d03d430dc3f6e74efeb5488ef15a448c2ebd6d5b7253fae","version":2}]}