{"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-4znc7i1j","versions":[{"created_at":"2026-06-10T13:13:56Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積97.8㎡(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":"a2478581aff8dc92a75ae448d130ad79ff6ffe7eb66c35485b313da23e66360e","version":10},{"created_at":"2026-06-10T09:05:52Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c84a679c74e8a334deadc13972153572ddac75613f199794934ea38fd510ea64","version":2}]}