{"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-smy5jvge","versions":[{"created_at":"2026-06-10T13:12:05Z","element_count":63,"note":"backfill: 延床=居室床スラブ実面積106.2㎡(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":"b2ce5e233c1c7e29c2c2ccd0e4fd949b5fa7c1c3f6b21e4c7c2f07ee9ebbf6a9","version":11},{"created_at":"2026-06-10T08:32:45Z","element_count":83,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"fd08415f0f07d8036d84956a0caf121b235f087c8a40921dbc458f351a9d699c","version":3}]}