{"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-ztjotz4h","versions":[{"created_at":"2026-06-13T19:17:00Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"70fea5629807a384e95079cb2b7abf0736b450b9bb76c9dd2303b87afb9aca4e","version":3},{"created_at":"2026-06-13T19:07:02Z","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":"5b5d427bc688cfbd777d97889435f985235d84296c481afcd5c81cc125f5b48c","version":2},{"created_at":"2026-06-13T19:06:58Z","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}]}