{"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-thebirchwoodhouse-xlavr7tj","versions":[{"created_at":"2026-06-13T19:03:08Z","element_count":90,"note":"5軸GA polish 45->96 by M5 (autonomous)","saved_by":"mcp","sha256":"8d39db6c30acd626eb01efe9aca9e5ed846d68b3a3453a10cf238747a987c2b0","version":3},{"created_at":"2026-06-13T18:45:28Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"21b275a5590aaac9ce51536429e5d1af30ff9aaf9a72658fc8c26f81d604e9e5","version":2},{"created_at":"2026-06-13T18:45:26Z","element_count":105,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}