{"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-house-eqt6arc8","versions":[{"created_at":"2026-06-10T22:58:19Z","element_count":66,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"7f33ad2caa33c48d093afde241f5bc2609e1b0553d9271e0602f564bf94b595e","version":9},{"created_at":"2026-06-10T20:07:29Z","element_count":70,"note":"5軸GA polish 60->93 by M5 (autonomous)","saved_by":"mcp","sha256":"9edd25e66935e045a235c0d33aa90419832696e8bb06557fdf76d33f70bb5903","version":2}]}