{"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-dtulvzs4","versions":[{"created_at":"2026-06-11T03:31:08Z","element_count":91,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"c763a1adaed00c67862e60dec088d63d862093528d6ac68c92600135b8a6457d","version":3},{"created_at":"2026-06-11T03:23:01Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e4d95044192121e822eac165941c3cc39423b09d09a0034f0dbd2f590d419efe","version":2}]}