{"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-willowbrookbungalow-9pzvvxuj","versions":[{"created_at":"2026-06-13T19:16:55Z","element_count":74,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"3b3ae0aa1f87002e6c7b73f7c75d87f3b8d5a226e72d77e3b2e0d88322f5251d","version":3},{"created_at":"2026-06-13T19:00:51Z","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":"49faf35639d1b33e44fe87e9ad1e589ea144f048bfc915220d556e54922a522b","version":2},{"created_at":"2026-06-13T19:00:48Z","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}]}