{"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-7ewja9kd","versions":[{"created_at":"2026-06-11T01:57:15Z","element_count":83,"note":"5軸GA polish 41->96 by M5 (autonomous)","saved_by":"mcp","sha256":"213513b0aeeea85894d27a65f728497ba4ed9c318bb0357f33fae8c35710125e","version":5},{"created_at":"2026-06-11T00:32:17Z","element_count":54,"note":"loop3: 設計時延床 50.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e26df0549d873dad60d272d3fcfb553129d8cfd284d37976b162a59c52011d96","version":2}]}