{"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-97rvpgc2","versions":[{"created_at":"2026-06-24T19:06:36Z","element_count":70,"note":"5軸GA polish 40->91 by M5 (autonomous)","saved_by":"mcp","sha256":"0e00815ef43ce08f6019c90e01d36759b691641e869a52a2141bd53eda222664","version":3},{"created_at":"2026-06-24T18:56:44Z","element_count":83,"note":"loop3: 設計時延床 80.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"b24d1a30ed1a1d12033087c4de6eef033d56961b37bc1771d619947a17e7bdbe","version":2},{"created_at":"2026-06-24T18:56:43Z","element_count":83,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}