{"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-8yjalasq","versions":[{"created_at":"2026-06-10T13:25:47Z","element_count":65,"note":"backfill: 延床=居室床スラブ実面積93.9㎡(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":"cc3fd741b6ff3e3ca301e405737c4a9bc4ab4e6967ac258a1baad29e78fc7e3f","version":10},{"created_at":"2026-06-10T11:26:44Z","element_count":84,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2992060196906ca6dcc4e5553242e8b371ba9dd5f08a2921d0551feacbff69c5","version":4}]}