{"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-hilltopbungalowhouse-i249v07q","versions":[{"created_at":"2026-06-13T18:49:00Z","element_count":91,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d13d5823b073eb0f4a4569c0a36da202fb694f3242c41fee9722f2808cc476a8","version":3},{"created_at":"2026-06-13T18:38:44Z","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":"42e36478c8eee5c7f2fdacde0d53cddcc76178412222bfdf8c024ca537dfd7e5","version":2},{"created_at":"2026-06-13T18:38:41Z","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}]}