{"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-cyjp7xrg","versions":[{"created_at":"2026-06-11T01:22:26Z","element_count":84,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"8ae2e3a67322b3ccc933effe76adcb19ebb5c39c4cc67a79748fdb47c423d3ab","version":12},{"created_at":"2026-06-10T22:45:09Z","element_count":44,"note":"loop3: 設計時延床 78.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"03de63f89f73ed2cce2d00a01775c1397b409a44ddc0977e316731aa840f356f","version":2}]}