{"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-willowcreekbungalow-1o2701c4","versions":[{"created_at":"2026-07-18T00:30:06Z","element_count":85,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"1584f5a38c1a22e8cd83cdfbef645d1c6bc28a8e7d24ee0d87707f6a676e09b2","version":3},{"created_at":"2026-07-18T00:10:15Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"4ff78a5235916c7c7269d8f68f476827f4663f63be3915c101835ecb412ca98e","version":2},{"created_at":"2026-07-18T00:10:15Z","element_count":90,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}