{"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-9ll354ry","versions":[{"created_at":"2026-06-13T18:35:25Z","element_count":72,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"d76c6c4e215ae4fd32eaa4ac8dd4e0c63a2fb66e2032f4f037b12069dc085d80","version":3},{"created_at":"2026-06-13T18:24:28Z","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":"2026-06-13T18:24:26Z","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}]}