{"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-theoldmillhouse-djycby7c","versions":[{"created_at":"2026-07-31T04:26:49Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d7d20c6a77d5001acd127adfae32aa830dce278bc46262dde1f6be97de008806","version":2},{"created_at":"2026-07-31T04:26:49Z","element_count":107,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}