{"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-hilltophaven-1lxq88hy","versions":[{"created_at":"2026-06-13T18:06:29Z","element_count":83,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"a1610d5b4be2bb4d128ea7fa08a5c3560f1a4c40d048d413e8984d63ad36e5a3","version":3},{"created_at":"2026-06-13T17:55:10Z","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":"ba39ecfd590d396d68fc8332b8a3c8e25ad4ddda00c3fea3ee65455bb5813c91","version":2},{"created_at":"2026-06-13T17:55:09Z","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}]}