{"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-87yjc76w","versions":[{"created_at":"2026-06-10T13:24:35Z","element_count":66,"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":"bcc5300b889359d85c74f5b397dcdc0dfa9b7536badb797cbc5581f1bceac883","version":10},{"created_at":"2026-06-10T10:53:13Z","element_count":74,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"7786f9c89a4fd69ef354aabc992e579519de52e9261c538676a19c2dae042a77","version":3}]}