{"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-xdqlm665","versions":[{"created_at":"2026-06-13T18:19:58Z","element_count":85,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4eeecfc24c369ade5e789f539f57a7dc774597de560cb1f5e849c7657468baf0","version":3},{"created_at":"2026-06-13T18:14:07Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"fcfa3ed013ed412c41a50de33297bc4e608601aec573ea6994c5f9dfb14892b7","version":2},{"created_at":"2026-06-13T18:14:04Z","element_count":134,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}