{"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-willowcreekhouse-fls80am5","versions":[{"created_at":"2026-06-13T19:16:51Z","element_count":85,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"20b836700478379dc29779766b61d96ac5f196adea88445a07d6b37b34439c5a","version":3},{"created_at":"2026-06-13T19:08:10Z","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":"d5e5fe3ee6b0a4997747caa3e67d963944652c9d299c745643b1e11c1128862e","version":2},{"created_at":"2026-06-13T19:08:08Z","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}]}