{"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-whitecityhavenhouse-0004o2d3","versions":[{"created_at":"2026-07-13T11:24:50Z","element_count":68,"note":"5軸GA polish 44->92 by M5 (autonomous)","saved_by":"mcp","sha256":"76f6782d9081d5f7266db450ad149830304ed777dbfbef31ad1a80cdad065b6f","version":3},{"created_at":"2026-07-13T11:19:33Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"35b97f2357b5388b91a49ff804e3a41e9cef6ff5eb77a8197342b7a6f6392e39","version":2},{"created_at":"2026-07-13T11:19:33Z","element_count":86,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}