Continue still displayed Checking for updates even when version lookup was disabled. Skip the update service before it emits checking state and retain the lower-level lookup guard in the shared local and Agent adapter.
Add a regression for disabled and normal update paths and record real terminal and production Electron validation. Seven real model requests returned HTTP 200; Linux validation covered startup only. The reported UI freeze was not reproduced, full Agent/model acceptance remains open, and full-suite failures are documented.
Release note: 修复 Continue 禁用自动更新后仍显示 Checking for updates 的问题，终端现在保持正常空闲状态。
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