{"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-willowbrookhouse-t03028r0","versions":[{"created_at":"2026-06-13T17:52:42Z","element_count":90,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b418f3ff01b5f6c3bc55532bafb895afd5a3a314b8ac7ac4303051c74ebfc9da","version":3},{"created_at":"2026-06-13T17:41:53Z","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":"f9c8e4fa1c6f62fb6af019446a011d1061bd35d059390d42228869026c00841a","version":2},{"created_at":"2026-06-13T17:41:52Z","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}]}