{"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-willowbrookhouse-x9pe3l5v","versions":[{"created_at":"2026-07-28T06:46:20Z","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":"93248bcd056168870dfeda1b53f6e63ef84bee5cf8bf2f76127704332996d23c","version":2},{"created_at":"2026-07-28T06:46:20Z","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}]}