{"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-r9inrhc4","versions":[{"created_at":"2026-06-13T19:03:59Z","element_count":84,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b8b5ff140e330436cb523f798a0120162787cc37114665b8b8fdb5295821cf57","version":3},{"created_at":"2026-06-13T18:56:52Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"3f43d1bb118e8e5915c565fd96353618a0fbcdb1e9462af7b747deeed737e864","version":2},{"created_at":"2026-06-13T18:56:51Z","element_count":107,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}