{"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-house-6s6q83eq","versions":[{"created_at":"2026-06-22T19:39:42Z","element_count":90,"note":"5軸GA polish 43->95 by M5 (autonomous)","saved_by":"mcp","sha256":"5170035552086c59229197af8d4d28485faf34579f3916aa38630cb37cc78c9c","version":3},{"created_at":"2026-06-22T19:27:43Z","element_count":85,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"315b45be0ae1a2365b6003c03631d04d74b25830f86d4a9ff44cee85028a1c76","version":2},{"created_at":"2026-06-22T19:27:42Z","element_count":85,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}