{"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-tramwayviewbungalow-54lzgdx1","versions":[{"created_at":"2026-07-02T23:58:08Z","element_count":82,"note":"5軸GA polish 40->93 by M5 (autonomous)","saved_by":"mcp","sha256":"7a6949c2b267bfa70eaf5aac9afea44060b07eb791fdd39ed9cb6a46fa834b20","version":3},{"created_at":"2026-07-02T23:47:39Z","element_count":119,"note":"loop3: 設計時延床 80.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"05064daac1fb493faf037ad6505ff49f2a3c2522e4891f86ba6a2f25ebdc17d9","version":2},{"created_at":"2026-07-02T23:47:39Z","element_count":119,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}