{"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-willowbrookbungalow-ioplv30t","versions":[{"created_at":"2026-06-11T04:23:38Z","element_count":85,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"1584f5a38c1a22e8cd83cdfbef645d1c6bc28a8e7d24ee0d87707f6a676e09b2","version":3},{"created_at":"2026-06-11T04:11:04Z","element_count":117,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"cf72a20fee2e754b77b96160261089017d00923b9ab3b68180d3208b5e1917d7","version":2}]}