{"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-willowbrookhouse-bg2b5yrc","versions":[{"created_at":"2026-06-13T18:34:27Z","element_count":72,"note":"5軸GA polish 46->96 by M5 (autonomous)","saved_by":"mcp","sha256":"545bdc3a278d057053fc32cf1e639ebf05a2db2d71097f136813062a1f065953","version":3},{"created_at":"2026-06-13T18:16:51Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"08fe6f87a6f6d374a66f01c1da80b9b287c1fdeb316a3b01f1b4ca69cf704d85","version":2},{"created_at":"2026-06-13T18:16:50Z","element_count":90,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}