{"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-z9n0cgou","versions":[{"created_at":"2026-06-13T18:06:22Z","element_count":89,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4a6cb222ff283933181da5f09958136e15d432276ac0fd857d0c0e8882d8746c","version":3},{"created_at":"2026-06-13T17:54:53Z","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":"2026-06-13T17:54:52Z","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}]}