{"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-riverviewbungalow-91g5px5u","versions":[{"created_at":"2026-07-23T11:12:09Z","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":"f7ff76789eb2401e4359a5f14895b3a9e2e4c9a8319f5996d700322c9d52d765","version":2},{"created_at":"2026-07-23T11:12:09Z","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}]}