{"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-k85rag4k","versions":[{"created_at":"2026-06-13T19:45:35Z","element_count":73,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ffc1afae725fae883cf531bbd9528dda03b46518eb745599dd3285d3d79b86f9","version":3},{"created_at":"2026-06-13T19:25:31Z","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":"4a1317f7ad059fb266d2c60a6215a1a8df7290a99a7acec406eb14996fa881b0","version":2},{"created_at":"2026-06-13T19:25:27Z","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}]}