{"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-e0c7cmwu","versions":[{"created_at":"2026-06-13T19:16:54Z","element_count":84,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"66757aa4646ec0a123ce8829eba79ece15d6a1bb038bffe5d2d970ca1b8222d5","version":3},{"created_at":"2026-06-13T19:10:58Z","element_count":87,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8c5b1857ffc77b34a4fc8547aeae3a76295fc260d81a243cd8b858b4cfa9a1f2","version":2},{"created_at":"2026-06-13T19:10:55Z","element_count":87,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}