{"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-willowcreekbungalow-v2gn45ze","versions":[{"created_at":"2026-06-13T18:34:42Z","element_count":85,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"1584f5a38c1a22e8cd83cdfbef645d1c6bc28a8e7d24ee0d87707f6a676e09b2","version":3},{"created_at":"2026-06-13T18:27:45Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"655e798648d802e423a29fbd0d09311b3b519420345eaa148bc36e0eadd27847","version":2},{"created_at":"2026-06-13T18:27:43Z","element_count":86,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}