{"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-65rgrw2g","versions":[{"created_at":"2026-06-10T22:58:54Z","element_count":77,"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":"33a7e86e95f99d09a17049555be3d74fc57fd1e888c9a9890fcc6874dc45337c","version":9},{"created_at":"2026-06-10T20:22:38Z","element_count":83,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"18e98f6177ff1395e685c62ca94f4f7c6b0c2e23250d9e65296e31883a4219dc","version":2}]}