{"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-xuwobbyv","versions":[{"created_at":"2026-06-13T18:35:09Z","element_count":72,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"9bccdd4dcee80ecf5dcde653206f1c1115c54d1dbb530ad33fa2b6400e650352","version":3},{"created_at":"2026-06-13T18:22:29Z","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":"3cda4de9f8f6450ffa61df309342b41342fdaade82db3e95d332872aaa8b60a3","version":2},{"created_at":"2026-06-13T18:22:27Z","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}]}