{"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-4txdzlxr","versions":[{"created_at":"2026-08-04T10:14:22Z","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":"4197f468f29f8304b3afd0f696b6f9249d38c8551962abdc185ae3cea5967f59","version":2},{"created_at":"2026-08-04T10:14:22Z","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}]}